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Debt - Schedule (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 853.2 $ 808.8
Current portion of long-term debt, net of debt issuance costs (10.1) (10.1)
Unamortized debt issuance costs (12.7) (14.2)
Non-current portion of debt 830.4 784.5
2.875% Convertible Senior Notes due 2021    
Debt Instrument [Line Items]    
Long-term debt 10.6 10.6
Other    
Debt Instrument [Line Items]    
Long-term debt 3.0 3.0
Senior secured credit agreement - Term loan due 2023    
Debt Instrument [Line Items]    
Long-term debt 441.6 447.2
Senior secured credit agreement - Revolver loan due 2023    
Debt Instrument [Line Items]    
Long-term debt $ 398.0 $ 348.0