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Long-term Debt and Other Borrowings - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total long-term debt $ 2,674.2 $ 2,681.2
Capital lease liability   19.5
Capital lease liability 18.5  
Less current portion (35.1)  
Less current portion   (37.0)
Total non-current long-term debt 2,639.1  
Total non-current long-term debt   2,644.2
Secured Debt | 2018 First Lien Loan    
Debt Instrument [Line Items]    
Unamortized discount and issuance costs 31.2 31.9
Total long-term debt 2,655.3 2,661.3
Notes payable to former stockholders    
Debt Instrument [Line Items]    
Total long-term debt $ 0.4 $ 0.4