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Financial Instrument, Risk Management and Fair Value Measurements, Derivatives Gain (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income [Roll Forward]      
Derivatives qualifying as hedges, net of tax $ (6.0) $ 1.9 $ (13.3)
Cash Flow Hedging      
Accumulated Other Comprehensive Income [Roll Forward]      
Accumulated other comprehensive income (loss), net of tax, beginning 5.2 7.1 (6.2)
Unrealized hedging gains (losses) and other, net of tax 13.7 (1.2) 7.3
Accumulated other comprehensive income (loss), net of tax, ending 11.2 5.2 7.1
Cash Flow Hedging | Interest Expense      
Accumulated Other Comprehensive Income [Roll Forward]      
Effective portion (7.6) (0.6) 6.5
Ineffective portion (0.1) (0.1) (0.5)
Derivatives qualifying as hedges, net of tax 6.0 (1.9) 13.3
Cash Flow Hedging | Foreign currency contracts      
Accumulated Other Comprehensive Income [Roll Forward]      
Accumulated other comprehensive income (loss), net of tax, beginning 4.4 4.6 (6.1)
Unrealized hedging gains (losses) and other, net of tax 14.2 (0.4) 6.1
Accumulated other comprehensive income (loss), net of tax, ending 10.4 4.4 4.6
Cash Flow Hedging | Foreign currency contracts | Cost of Sales and Services      
Accumulated Other Comprehensive Income [Roll Forward]      
Effective portion (8.1) 0.3 5.1
Ineffective portion (0.1) (0.1) (0.5)
Derivatives qualifying as hedges, net of tax 6.0 (0.2) 10.7
Cash Flow Hedging | Energy contracts      
Accumulated Other Comprehensive Income [Roll Forward]      
Accumulated other comprehensive income (loss), net of tax, beginning 0.0 1.4 (1.3)
Unrealized hedging gains (losses) and other, net of tax 0.0 (0.8) 1.2
Accumulated other comprehensive income (loss), net of tax, ending 0.0 0.0 1.4
Cash Flow Hedging | Energy contracts | Cost of Sales and Services      
Accumulated Other Comprehensive Income [Roll Forward]      
Effective portion 0.0 (0.6) 1.5
Ineffective portion 0.0 0.0 0.0
Derivatives qualifying as hedges, net of tax 0.0 (1.4) 2.7
Cash Flow Hedging | Other      
Accumulated Other Comprehensive Income [Roll Forward]      
Accumulated other comprehensive income (loss), net of tax, beginning 0.8 1.1 1.2
Unrealized hedging gains (losses) and other, net of tax (0.5) 0.0 0.0
Accumulated other comprehensive income (loss), net of tax, ending 0.8 0.8 1.1
Cash Flow Hedging | Other | Interest Expense      
Accumulated Other Comprehensive Income [Roll Forward]      
Effective portion 0.5 (0.3) (0.1)
Ineffective portion 0.0 0.0 0.0
Derivatives qualifying as hedges, net of tax 0.0 (0.3) (0.1)
Derivatives Not Designated as Hedging Instruments      
Accumulated Other Comprehensive Income [Roll Forward]      
Amount of pre-tax gain or (loss) recognized in income on derivatives (10.9) (12.5) (44.2)
Derivatives Not Designated as Hedging Instruments | Foreign currency contracts | Cost of Sales and Services      
Accumulated Other Comprehensive Income [Roll Forward]      
Amount of pre-tax gain or (loss) recognized in income on derivatives $ (10.9) $ (12.5) $ (44.2)