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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
$ in Millions
12 Months Ended
Sep. 20, 2019
USD ($)
Dec. 31, 2020
USD ($)
MMBTU
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Estimated fair value of debt   $ 3,640.0 $ 3,393.8    
Carrying amount of debt   3,267.8 3,258.8    
Cumulative changes in net gain (loss) from cash flow hedges   72.8 66.0 $ (11.2) $ (5.2)
Loss on settlement   (1.9) 16.7    
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   11.6 1.4 (10.4) (4.4)
Foreign currency contracts | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Derivative, notional amount   1,881.0      
Foreign currency contracts | Not Designated as Hedging Instruments          
Segment Reporting Information [Line Items]          
Derivative, notional amount   2,026.0      
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   18.3      
Interest rate contracts          
Segment Reporting Information [Line Items]          
Cumulative changes in net gain (loss) from cash flow hedges   61.2 $ 64.6 $ (0.8) $ (0.8)
Interest rate contracts | Cash Flow Hedging | Designated as Cash Flow Hedges          
Segment Reporting Information [Line Items]          
Derivative, notional amount   $ 100.0      
Loss on settlement $ 83.1        
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   $ 18.3