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

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Derivative Instruments and Hedging Activities - Additional Information (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items]
Amount of loss recognized in income	$ 5.9
Cross-currency swap
Derivatives, Fair Value [Line Items]
Notional amount of derivatives		€ 450.0	$ 498.0
5.30% Unsecured Senior Notes due November 15, 2043
Derivatives, Fair Value [Line Items]
Repayments of debt	$ 309.5
Interest rate, stated percentage	5.30%
4.00% Unsecured Senior Notes due November 15, 2023
Derivatives, Fair Value [Line Items]
Repayments of debt	$ 584.4
Interest rate, stated percentage	4.00%