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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	Sep. 20, 2019 USD ($)	Jun. 30, 2021 USD ($) MMBTU	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) MMBTU	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Estimated fair value of debt		$ 4,097.0		$ 4,097.0		$ 3,640.0
Carrying value of debt		3,816.6		3,816.6		$ 3,267.8
Loss on settlement		2.0	$ 5.1	(2.0)	$ (6.9)
Designated as Cash Flow Hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount		$ 1,264.4		$ 1,264.4
Designated as Cash Flow Hedges | Energy contracts
Derivative [Line Items]
Nonmonetary notional amount of price risk cash flow hedge (in mmBTUs) | MMBTU		0		0
Designated as Cash Flow Hedges | Foreign Currency and Energy Contracts
Derivative [Line Items]
Net gains (losses) on cash flow hedges		$ (12.1)		$ (12.1)
Not Designated as Hedging Instruments | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount		2,151.5		2,151.5
Cash Flow Hedging | Designated as Cash Flow Hedges
Derivative [Line Items]
Net gains (losses) on cash flow hedges		2.6		2.6
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts
Derivative [Line Items]
Net gains (losses) on cash flow hedges		(12.8)		(12.8)
Cash Flow Hedging | Designated as Cash Flow Hedges | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount		$ 100.0		$ 100.0
Loss on settlement	$ 83.1

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