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Debt - Schedule of Debt Obligations (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt excluding financing lease liabilities $ 1,238.0  
Financing lease liabilities (Please refer to Note 13) 10.3 $ 8.8
Total debt 1,248.3 673.5
Less current portion of long-term debt 8.2 7.2
Long-term debt, less current portion 1,115.4 660.6
Convertible Senior Notes [Member]    
Debt Instrument [Line Items]    
Total debt excluding financing lease liabilities 575.0  
Term Debt and Convertible Senior Notes [Member]    
Debt Instrument [Line Items]    
Less unamortized discount on Term Debt and Convertible Senior Notes 109.0 1.2
Less unamortized debt issuance costs on Term Debt and Convertible Senior Notes 15.7 4.5
Term Debt [Member]    
Debt Instrument [Line Items]    
Total debt excluding financing lease liabilities $ 663.0 $ 664.7