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Derivative Financial Instruments and Concentrations of Credit Risk (Details) lb in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) lb	Dec. 31, 2019 USD ($) lb	Dec. 31, 2018 USD ($)	Feb. 29, 2020 USD ($)	Mar. 31, 2018 USD ($)
Derivative disclosures
Other income (expense), net	$ 2,700,000	$ (5,200,000)	$ (7,600,000)
Interest Rate Swap
Derivative disclosures
Unrealized gain (loss), net of taxes, recorded in AOCI from cash flow hedges	5,900,000	1,900,000
Interest Rate Swap | Derivative contracts designated as hedging instruments
Derivative disclosures
Fair value of derivatives	7,800,000	2,500,000
Interest Rate Swap | Derivative contracts designated as hedging instruments | Short Term Liability
Derivative disclosures
Derivative liability	1,400,000
Interest Rate Swap, Through March 2021 | Derivative contracts designated as hedging instruments
Derivative disclosures
Derivative notional amount	234,000,000.0				$ 260,000,000.0
Fixed interest rate (percentage)					2.535%
Interest Rate Swap Through November2024 | Derivative contracts designated as hedging instruments
Derivative disclosures
Derivative notional amount				$ 248,400,000
Fixed interest rate (percentage)				1.061%
FX Forward Contracts
Derivative disclosures
Derivative notional amount	6,300,000	26,000,000.0
Commodity contract
Derivative disclosures
Unrealized gain (loss), net of taxes, recorded in AOCI from cash flow hedges	(1,500,000)	(300,000)
Cash flow hedge asset	$ 2,400,000	$ 400,000
Commodity contract | Derivative contracts designated as hedging instruments
Derivative disclosures
Notional amount of commodity contracts | lb	3.2	3.4

X

- Definition

Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

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-Topic 220
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Nominal mass used to calculate payments on a derivative instrument.

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Fair value as of the balance sheet date of all price risk derivative assets designated as cash flow hedging instruments.

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