Quarterly report pursuant to Section 13 or 15(d)

SHAREHOLDERS' EQUITY (Accumulated Other Comprehensive Income (Loss)) (Details)

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SHAREHOLDERS' EQUITY (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning Balance $ (306.3) $ (484.8) $ (444.1) $ (666.7) $ (703.0) $ (1,330.5) $ (444.1) $ (1,330.5)
Ending Balance (86.2) (306.3) (484.8) (833.1) (666.7) (703.0) (86.2) (833.1)
Changes in Pension and Other Post-Retirement Benefits, net of tax [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning Balance (250.5) (257.2) (263.9) (244.5) (250.9) (260.6) (263.9) (260.6)
Other comprehensive income (loss) before reclassifications 0.3 0.2 0.5 (18.7) (0.1) 3.3    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 6.5 6.5 6.2 6.8 6.5 6.4    
Ending Balance (243.7) (250.5) (257.2) (256.4) (244.5) (250.9) (243.7) (256.4)
Unrealized Net Gain (Loss) on Foreign Currency Translation [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning Balance 228.3 226.1 225.4 225.1 226.6 239.3 225.4 239.3
Other comprehensive income (loss) before reclassifications (0.2) 2.2 0.7 0.5 (1.5) (12.7)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (228.1) 0.0 0.0 0.0 0.0 0.0    
Ending Balance 0.0 228.3 226.1 225.6 225.1 226.6 0.0 225.6
Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning Balance 0.0 (0.2) (0.5)       (0.5)  
Other comprehensive income (loss) before reclassifications 0.2 0.2 0.4          
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.1 0.0 (0.1)          
Ending Balance 0.3 0.0 (0.2)       0.3  
Accumulated Other Comprehensive Income (Loss) [Member]                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning Balance (22.2) (31.3) (39.0) (19.4) (24.3) (21.3) (39.0) (21.3)
Other comprehensive income (loss) before reclassifications 0.3 2.6 1.6 (18.2) (1.6) (9.4)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (221.5) 6.5 6.1 6.8 6.5 6.4    
Ending Balance $ (243.4) $ (22.2) $ (31.3) $ (30.8) $ (19.4) $ (24.3) $ (243.4) $ (30.8)