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

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Long-term debt - Components of Long-term Indebtedness (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Nov. 14, 2017	Jan. 29, 2014
Debt Instrument [Line Items]
Total debt	$ 822.5	$ 808.8
Current portion of debt, net of debt issuance costs	(12.9)	(10.1)
Unamortized debt issuance costs	(11.2)	(14.2)
Debt, net of current portion	798.4	784.5
2.875% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Total debt	$ 10.6	10.6
Interest rate, stated percentage	2.875%		2.875%	2.875%
Other
Debt Instrument [Line Items]
Total debt	$ 3.0	3.0
Term Loan Facility
Debt Instrument [Line Items]
Total debt	435.9	447.2
Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	$ 373.0	$ 348.0