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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 20, 2019 USD ($)	Sep. 30, 2021 USD ($) MMBTU	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) MMBTU	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Estimated fair value of debt		$ 3,650.8		$ 3,650.8		$ 3,640.0
Carrying value of debt		3,393.7		3,393.7		$ 3,267.8
Loss on settlement		(0.5)	$ 3.9	(2.5)	$ (3.0)
Designated as Cash Flow Hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount		$ 1,143.4		$ 1,143.4
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		$ 23.7		$ 23.7
Not Designated as Hedging Instruments | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount		1,820.0		1,820.0
Cash Flow Hedging | Designated as Cash Flow Hedges
Derivative [Line Items]
Net gains (losses) on cash flow hedges		3.4		3.4
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts
Derivative [Line Items]
Net gains (losses) on cash flow hedges		27.8		27.8
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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