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PENSION AND OTHER POSTRETIREMENT BENEFITS (Effect of Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Other Benefit Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | 12 Months Ended | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2012
Hedge Funds [Member]
|
Dec. 31, 2011
Hedge Funds [Member]
|
Dec. 31, 2012
Private Equity Funds [Member]
|
Dec. 31, 2011
Private Equity Funds [Member]
|
Dec. 31, 2012
Real Estate [Member]
|
Dec. 31, 2011
Real Estate [Member]
|
Dec. 31, 2012
Other Benefits [Member]
|
Dec. 31, 2011
Other Benefits [Member]
|
Dec. 31, 2010
Other Benefits [Member]
|
Dec. 31, 2012
Other Benefits [Member]
Hedge Funds [Member]
|
Dec. 31, 2011
Other Benefits [Member]
Hedge Funds [Member]
|
Dec. 31, 2012
Other Benefits [Member]
Private Equity Funds [Member]
|
Dec. 31, 2011
Other Benefits [Member]
Private Equity Funds [Member]
|
Dec. 31, 2012
Other Benefits [Member]
Structured Credit [Member]
|
Dec. 31, 2012
Other Benefits [Member]
Real Estate [Member]
|
Dec. 31, 2011
Other Benefits [Member]
Real Estate [Member]
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
|
Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Hedge Funds [Member]
|
Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Hedge Funds [Member]
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Private Equity Funds [Member]
|
Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Private Equity Funds [Member]
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Structured Credit [Member]
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Real Estate [Member]
|
Dec. 31, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Benefits [Member]
Real Estate [Member]
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||||||||||||||||||||||||||
| Fair value of plan assets — beginning of year | $ 192.2 | $ 186.0 | $ 100.7 | $ 105.8 | $ 30.1 | $ 25.0 | $ 16.5 | $ 15.5 | $ 237.0 | $ 193.5 | $ 174.2 | $ 23.2 | $ 28.3 | $ 6.2 | $ 8.7 | $ 12.5 | $ 15.9 | $ 10.2 | $ 45.3 | $ 28.9 | $ 28.3 | $ 24.0 | $ 6.8 | $ 4.9 | $ 0 | $ 10.2 | $ 0 |
| Actual return on plan assets: | |||||||||||||||||||||||||||
| Relating to assets still held at the reporting date | 21.8 | 7.0 | 4.2 | (2.4) | 1.4 | 2.6 | 4.9 | 1.6 | 4.0 | 1.4 | 0.9 | (0.4) | 0.3 | 1.4 | 1.5 | 1.3 | 0.4 | ||||||||||
| Acquired through business combinations | 14.4 | 40.2 | 0 | 35.8 | 2.2 | 4.4 | 12.2 | 0 | 15.6 | 18.4 | 0 | 7.7 | 0.2 | 0.9 | 11.0 | 4.4 | 9.8 | ||||||||||
| Sales | (27.1) | (45.0) | (19.0) | (39.0) | (4.4) | (4.9) | (3.7) | (1.1) | (7.1) | (3.4) | (6.0) | (3.0) | (1.1) | (0.4) | 0 | 0 | 0 | ||||||||||
| Fair value of plan assets — end of year | $ 200.5 | $ 192.2 | $ 85.6 | $ 100.7 | $ 29.3 | $ 30.1 | $ 29.4 | $ 16.5 | $ 237.0 | $ 193.5 | $ 174.2 | $ 23.2 | $ 28.3 | $ 6.2 | $ 8.7 | $ 12.5 | $ 15.9 | $ 10.2 | $ 57.8 | $ 45.3 | $ 23.2 | $ 28.3 | $ 6.2 | $ 6.8 | $ 12.5 | $ 15.9 | $ 10.2 |