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Debt - Schedule of Debt Obligations (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 676.6 $ 678.3
Less unamortized discount on Term Debt 1.6 1.7
Less unamortized debt issuance costs on Senior Notes and Term Debt 6.1 6.3
Less current portion of long-term debt 6.8 6.8
Long-term debt, less current portion 662.1 663.5
Term Debt [Member]    
Debt Instrument [Line Items]    
Total debt $ 676.6 $ 678.3