Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Components Of Net Periodic Benefit Cost) (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Components Of Net Periodic Benefit Cost) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 188.6 $ 200.5 $ 192.2
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 915.3 838.7 744.1
Service cost 38.9 32.0 23.6
Interest cost 45.9 48.4 51.4
Expected return on plan assets (65.6) (59.5) (61.2)
Amortization:      
Net asset 0 0 0
Prior service costs (credits) (3.0) (3.9) (4.4)
Net actuarial loss 29.9 30.4 19.6
Net periodic benefit cost 52.1 55.2 37.8
Acquired through business combinations 0 0 0
Current year actuarial (gain)/loss (168.8) 53.1 165.3
Amortization of net loss 29.9 30.4 19.6
Current year prior service cost 0.8 2.8 0
Amortization of prior service (cost) credit (3.0) (3.9) (4.4)
Amortization of transition asset 0 0 0
Total recognized in other comprehensive income (200.9) 21.6 141.3
Total recognized in net periodic cost and other comprehensive income (148.8) 76.8 179.1
Defined Benefit Plan, Benefit Obligation (1,118.0) (1,244.3) (1,141.4)
Defined Benefit Plan, Funded Status of Plan (202.7) (405.6)  
Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 251.8 237.0 193.5
Service cost 12.3 14.7 11.1
Interest cost 17.3 20.6 22.3
Expected return on plan assets (20.1) (17.7) (16.1)
Amortization:      
Net asset 0 (3.0) (3.0)
Prior service costs (credits) 3.6 (1.9) (3.7)
Net actuarial loss 11.5 11.6 8.8
Net periodic benefit cost 17.4 28.1 26.8
Acquired through business combinations 0 0 0
Current year actuarial (gain)/loss (95.2) 3.2 46.8
Amortization of net loss 11.5 11.6 8.8
Current year prior service cost 0 (58.3) 0
Amortization of prior service (cost) credit 3.6 (1.9) (3.7)
Amortization of transition asset 0 3.0 3.0
Total recognized in other comprehensive income (103.1) (65.6) 37.3
Total recognized in net periodic cost and other comprehensive income (85.7) (37.5) 64.1
Defined Benefit Plan, Benefit Obligation (356.2) (459.8) (488.4)
Defined Benefit Plan, Funded Status of Plan (104.4) (222.8)  
Salaried Employees [Member] | Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 357.4 328.2  
Amortization:      
Defined Benefit Plan, Benefit Obligation (427.2) (464.4)  
Defined Benefit Plan, Funded Status of Plan (69.8) (136.2)  
Salaried Employees [Member] | Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Amortization:      
Defined Benefit Plan, Benefit Obligation (53.6) (72.6)  
Defined Benefit Plan, Funded Status of Plan (53.6) (72.6)  
Hourly Employees [Member] | Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 552.7 506.4  
Amortization:      
Defined Benefit Plan, Benefit Obligation (674.8) (764.8)  
Defined Benefit Plan, Funded Status of Plan (122.1) (258.4)  
Hourly Employees [Member] | Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 251.8 237.0  
Amortization:      
Defined Benefit Plan, Benefit Obligation (302.6) (387.2)  
Defined Benefit Plan, Funded Status of Plan (50.8) (150.2)  
Mining Employees [Member] | Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5.2 4.1  
Amortization:      
Defined Benefit Plan, Benefit Obligation (6.8) (6.4)  
Defined Benefit Plan, Funded Status of Plan (1.6) (2.3)  
Supplemental Executive Retirement Plan S E R P [Member] | Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Amortization:      
Defined Benefit Plan, Benefit Obligation (9.2) (8.7)  
Defined Benefit Plan, Funded Status of Plan $ (9.2) $ (8.7)