Derivative Instruments (Narrative) (Details)	1 Months Ended		3 Months Ended			6 Months Ended	9 Months Ended
	Feb. 28, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Derivative
Debt Instrument, Interest Rate, Effective Percentage		5.10%	4.20%				4.20%
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent			$ 3,729,000		$ 2,826,000		$ 27,556,000	$ (25,717,000)
Amount of derivaitve cash flow hedge to be repcognized in the next 12 months							7,000,000	8,000,000
Repayments of Secured Debt							300,000,000	249,214,000
Amortization of Debt Issuance Costs			1,707,000		1,032,000		7,075,000	3,094,000
Separated Host Financial Instrument, Fair Value Option
Derivative
Derivative liability fair value			7,600,000				7,600,000
Not Designated as Hedging Instrument
Derivative
Derivative liability fair value		$ 1,063,000	1,077,000				1,077,000
Other long-term obligations | Separated Host Financial Instrument, Fair Value Option
Derivative
Derivative liability fair value			5,100,000				5,100,000
Other accrued liabilities | Separated Host Financial Instrument, Fair Value Option
Derivative
Derivative liability fair value			2,500,000				2,500,000
2018 Credit Agreement | Term Loan Facility
Derivative
Repayments of Secured Debt		$ 500,000,000	100,000,000				300,000,000
Amortization of Debt Issuance Costs	$ 900,000		$ 500,000				$ 1,800,000
Foreign currency derivatives
Derivative
Derivative, notional amount		71,000,000	102,900,000				102,900,000
Commodity derivative contracts
Derivative
Derivative, notional amount		61,300,000	28,900,000				28,900,000
Pre-tax net unrealized gain (loss) within Accumulated Other Comprehensive Income				$ (2,200,000)			$ 12,300,000
Derivative Instruments Not Designated as Hedging Instruments, Loss			$ 200,000				700,000
Commodity derivative contracts | Not Designated as Hedging Instrument | Interest expense
Derivative
Derivative, Gain (Loss) on Derivative, Net							(682,000)	(321,000)
Commodity derivative contracts | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative liability fair value		$ 13,769,000	848,000				848,000
Commodity derivative contracts | Other long-term obligations | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative liability fair value		1,898,000	0				0
Commodity derivative contracts | Other accrued liabilities | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative liability fair value		888,000	0				0
Interest rate swap contract
Derivative
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent						$ 11,000,000	1,700,000
Derivative, Notional Amount					500,000,000			500,000,000
Interest rate swap contract | Designated as Hedging Instrument | Interest expense
Derivative
Derivative, Gain (Loss) on Derivative, Net			285,000		1,537,000		1,571,000	2,852,000
Interest rate swap contract | Not Designated as Hedging Instrument | Interest expense
Derivative
Derivative, Gain (Loss) on Derivative, Net							866,000	0
Interest rate swap contract | Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount		250,000,000
Interest rate swap contract | Other long-term obligations | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative liability fair value		6,903,000	0				0
Interest rate swap contract | Other accrued liabilities | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative liability fair value		$ 4,080,000	848,000				848,000
Interest rate swap contract 2
Derivative
Derivative, Notional Amount					$ 500,000,000			$ 500,000,000
Interest Rate Swap Four
Derivative
Derivative, Notional Amount			$ 250,000,000				$ 250,000,000
Scenario, Plan
Derivative
Debt Instrument, Interest Rate, Effective Percentage		4.85%	3.95%				3.95%