Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) and Related Tax Effects (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Before Taxes $ (458.0) $ (411.6) $ (162.4)  
Accumulated Other Comprehensive Income (Loss), Tax 139.2 127.7 123.4  
Accumulated other comprehensive income (loss) (318.8) (283.9) (39.0) $ (21.3)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Before Taxes (454.1) (408.1) (387.3)  
Accumulated Other Comprehensive Income (Loss), Tax 138.4 127.0 123.4  
Accumulated other comprehensive income (loss) (315.7) (281.1) (263.9)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Before Taxes (3.9) (3.5) (0.5)  
Accumulated Other Comprehensive Income (Loss), Tax 0.8 0.7 0.0  
Accumulated other comprehensive income (loss) $ (3.1) $ (2.8) (0.5)  
Foreign Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Before Taxes     225.4  
Accumulated Other Comprehensive Income (Loss), Tax     0.0  
Accumulated other comprehensive income (loss)     $ 225.4