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

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Long-term debt - Components of Long-term Indebtedness (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Aug. 07, 2020	Jan. 29, 2014
Debt Instrument [Line Items]
Total debt	$ 849,600,000	$ 885,500,000
Current portion of debt, net of debt issuance costs	(31,600,000)	(33,800,000)
Unamortized debt issuance costs	(8,500,000)	(10,700,000)
Debt, net of current portion	809,400,000	841,000,000.0
Term Loan
Debt Instrument [Line Items]
Total debt	396,600,000	421,900,000
Line of Credit
Debt Instrument [Line Items]
Total debt	$ 0	$ 0
3.875% Senior Unsecured Notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.875%	3.875%	3.875%
Total debt	$ 450,000,000.0	$ 450,000,000.0	$ 450,000,000
2.875% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	2.875%			2.875%
2.875% Convertible Senior Notes due 2021 \| Convertible Debt
Debt Instrument [Line Items]
Total debt	$ 0	10,600,000
Other
Debt Instrument [Line Items]
Total debt	$ 3,000,000.0	$ 3,000,000.0