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Debt - Schedule (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Aug. 07, 2020
Jan. 29, 2014
Debt Instrument [Line Items]        
Long-term debt $ 863.6 $ 885.5    
Current portion of long-term debt, net of debt issuance costs (28.8) (33.8)    
Unamortized debt issuance costs (9.6) (10.7)    
Non-current portion of debt 825.2 841.0    
Term Loan        
Debt Instrument [Line Items]        
Long-term debt $ 410.6 $ 421.9    
3.875% Senior Unsecured Notes due 2028 | Senior Notes        
Debt Instrument [Line Items]        
Stated percentage 3.875% 3.875% 3.875%  
Long-term debt $ 450.0 $ 450.0 $ 450.0  
2.875% Convertible Senior Notes due 2021        
Debt Instrument [Line Items]        
Stated percentage 2.875%     2.875%
2.875% Convertible Senior Notes due 2021 | Convertible Debt        
Debt Instrument [Line Items]        
Long-term debt $ 0.0 10.6    
Other        
Debt Instrument [Line Items]        
Long-term debt $ 3.0 $ 3.0