Fair Value Measurements (Details) $ in Thousands, € in Billions	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 09, 2018 EUR (€)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Line of Credit	$ 1,200,000	$ 1,600,000
Derivative Liability, Noncurrent	0	23,349
Fair Value, Recurring [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	63,892	67,055
Financial and Nonfinancial Liabilities, Fair Value Disclosure	123,753	99,839
Fair Value, Recurring [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	63,490	60,637
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		3,262
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,952
Fair Value, Recurring [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	11,928	11,539
Fair Value, Recurring [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	67,500	63,981
Fair Value, Recurring [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		3,156
Financial and Nonfinancial Liabilities, Fair Value Disclosure	42,121	24,319
Fair Value, Recurring [Member] | Forward Contracts
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	402
Financial and Nonfinancial Liabilities, Fair Value Disclosure	252
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Forward Contracts
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	63,892	67,055
Financial and Nonfinancial Liabilities, Fair Value Disclosure	111,825	88,300
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	63,490	60,637
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		3,262
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,952
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	67,500	63,981
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		3,156
Financial and Nonfinancial Liabilities, Fair Value Disclosure	42,121	24,319
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	402
Financial and Nonfinancial Liabilities, Fair Value Disclosure	252
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	11,928	11,539
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	11,928	11,539
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Forward Contracts
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Euro Notes 2026/28 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt	1,172,100	1,121,300	€ 1.0
Long-term Debt, Fair Value	1,200,000	1,200,000
Euro Notes (2024)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt	586,050	560,650
Long-term Debt, Fair Value	617,000	632,000
US Notes (2023) [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt	$ 0	600,000
Long-term Debt, Fair Value		$ 609,000