Significant Accounting Policies Fair Value Measurements (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, net			$ 48,900
Debt and Capital Lease Obligations		$ 2,163,500	1,693,500
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value		2,277,800	1,769,300
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt and Capital Lease Obligations		2,163,500	1,693,500
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, net			48,900
Total assets at fair value		51,000
Non-qualified deferred compensation liabilities			(48,900)
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(72,500)	(57,000)
Fair value, measurements, recurring | Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-qualified deferred compensation assets		51,000	48,900
Non-qualified deferred compensation liabilities		(51,000)
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value		51,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(51,000)	(48,900)
Fair value, measurements, recurring | Level 1 | Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-qualified deferred compensation assets		51,000	48,900
Non-qualified deferred compensation liabilities		(51,000)	(48,900)
Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value		0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure		(21,500)	(8,100)
Foreign Exchange Contract | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, net		(1,100)	(100)
Foreign Exchange Contract | Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, net			(100)
Interest rate swap | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, net		(20,400)	(8,000)
Interest rate swap | Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, net			(8,000)
Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value— Assets		4,800	1,100
Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	[1]	1,100
Fair Value— Assets	[1]	4,800	1,100
Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value— Assets		0	$ (8,000)	[1]
Derivative Liability, Fair Value, Gross Liability	[1]	$ 20,400

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