Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Nominal or face amount used to calculate payment on derivative.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Derivative Instruments and Hedging Activities - Additional Information (Details)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Aug. 31, 2020	Mar. 31, 2020 EUR (€)	Aug. 31, 2019 USD ($)	Aug. 31, 2019 EUR (€)	Jul. 31, 2019 USD ($)
Euro Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Stated interest rate (as a percent)					3.00%
Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative net gains	$ (1,082,000)
Net Investment Hedges \| Designated as Hedging Instrument \| Euro Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged notes \| €						€ 300,000,000
Cumulative net gains	3,256,000
Interest Rate Swap Agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 350,000,000	$ 350,000,000							$ 350,000,000
Cross-currency Swap Agreements \| Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount			$ 359,200,000	€ 300,000,000			$ 110,000,000	€ 99,055,000
Interest rate			4.50%	4.50%			6.00%	6.00%
Weighted average interest rate			3.40%	3.40%			3.65%	3.65%