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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Long-Term Debt (Narrative) (Details) - USD ($)	3 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2025	Sep. 01, 2022	Aug. 31, 2022	Oct. 01, 2021	Sep. 30, 2021	Mar. 31, 2021	Apr. 01, 2020	Dec. 31, 2019	May 31, 2019	Apr. 30, 1998
Debt Instrument [Line Items]
Accrued interest expense	$ 600,000										$ 400,000
Credit agreement, potential increase to term loan and line of credit	300,000,000.0
Debt issuance costs												$ 9,700,000
Debt issuance costs capitalized												9,600,000
Loss (Gain) on Extinguishment of Debt		$ 1,500,000
Unamortized costs												$ 14,600,000
Debt issuance costs expensed	1,235,000		$ 1,302,000
Liability for interest rate swap agreements											47,700,000
Market value adjustments on interest rate swaps, net of tax	(36,890,000)		(12,206,000)
Interest Rate Cash Flow Hedge Expense/(Income) Reclassified to Earnings, Pre-Tax	15,800,000		(1,700,000)
Forecast
Debt Instrument [Line Items]
Interest Rate Cash Flow Hedge Expense/(Income) to be Reclassified During Next 12 Months, Pre-Tax									$ 21,100,000
Interest Rate Swap
Debt Instrument [Line Items]
Remaining notional balance	$ 1,300,000,000
Derivative, average fixed interest rate	2.08%
Asset for Swaps											600,000
Interest Rate Swap \| Minimum
Debt Instrument [Line Items]
Derivative, average fixed interest rate	0.66%
Interest Rate Swap \| Maximum
Debt Instrument [Line Items]
Derivative, average fixed interest rate	2.98%
Interest Rate Swap \| Recurring
Debt Instrument [Line Items]
Asset for Swaps											572,000
Derivative Liability	$ 96,272,000										47,691,000
Interest Rate Swap \| Recurring \| Level 2
Debt Instrument [Line Items]
Asset for Swaps											572,000
Derivative Liability	96,272,000										$ 47,691,000
Interest Rate Swap \| Forecast
Debt Instrument [Line Items]
Remaining notional balance				$ 465,000,000.0	$ 496,800,000	$ 1,000,000,000.0	$ 1,100,000,000	$ 1,200,000,000		$ 1,300,000,000
Derivative, average fixed interest rate				2.61%		2.64%		2.51%
Swap
Debt Instrument [Line Items]
Market value adjustments on interest rate swaps, net of tax	(36,900,000)		(12,200,000)
Deferred taxes on interest rate swaps	12,300,000		$ 4,100,000
Line of Credit Due May 2024 \| Revolving line of credit
Debt Instrument [Line Items]
Multicurrency revolving sub-facility	100,000,000.0
Line of Credit Due May 2024 \| Letter of Credit
Debt Instrument [Line Items]
Revolving credit facility, letter of credit sub-facility	50,000,000.0
Term loan facility \| Term Loan A-1 Due May 2024
Debt Instrument [Line Items]
Term facility, maximum borrowing capacity	$ 1,800,000,000
Term of loan facility	5 years
Line of Credit Due May 2024 \| Revolving line of credit
Debt Instrument [Line Items]
Term facility, maximum borrowing capacity	$ 750,000,000.0
Revolving line of credit, remaining borrowing capacity	750,000,000.0
Senior notes \| 7.55% senior debentures due April 2028
Debt Instrument [Line Items]
Debt instrument, face amount													$ 100,000,000.0
Accounts Payable and Accrued Liabilities
Debt Instrument [Line Items]
Derivative Liability	$ 6,200,000