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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
$ in Millions
Sep. 20, 2019
USD ($)
Dec. 31, 2019
USD ($)
MMBTU
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]          
Estimated fair value of debt   $ 3,393.8 $ 2,715.2    
Carrying amount of debt   3,258.8 2,692.7    
Cumulative changes in net gain (loss) from cash flow hedges   66.0 (11.2) $ (5.2) $ (7.1)
Cash Flow Hedging | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Cumulative changes in net gain (loss) from cash flow hedges   0.7      
Foreign currency contracts          
Segment Reporting Information [Line Items]          
Cumulative changes in net gain (loss) from cash flow hedges   1.4 (10.4) (4.4) (4.6)
Foreign currency contracts | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Derivative, notional amount   1,633.0      
Foreign currency contracts | Not Designated as Hedging Instruments          
Segment Reporting Information [Line Items]          
Derivative, notional amount   1,264.0      
Foreign currency contracts | Cash Flow Hedging | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Cumulative changes in net gain (loss) from cash flow hedges   0.4      
Interest rate contracts          
Segment Reporting Information [Line Items]          
Cumulative changes in net gain (loss) from cash flow hedges   64.6 (0.8) (0.8) (1.1)
Interest rate contracts | Cash Flow Hedging | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Derivative, notional amount   200.0      
Loss on settlement $ 83.1        
Energy contracts          
Segment Reporting Information [Line Items]          
Cumulative changes in net gain (loss) from cash flow hedges   $ 0.0 $ 0.0 $ 0.0 $ (1.4)
Energy contracts | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Aggregate notional volume of outstanding natural gas (mmBTU) | MMBTU   0      
Foreign currency and energy contracts | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Loss on derivative contracts   $ 1.0