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LONG-TERM DEBT - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 14, 2019
Debt Instrument [Line Items]      
Total debt $ 2,126.6 $ 2,676.6  
Less: current portion of total debt 114.6 103.1  
Less: unamortized debt issuance costs 13.3 14.2  
Long-term portion of total debt 1,998.7 2,559.3  
Line of credit | $1.2 billion senior credit facility, due in 2022      
Debt Instrument [Line Items]      
Total debt 621.5 758.7  
Term Loan | $1.3 billion Term Loan, due in 2022      
Debt Instrument [Line Items]      
Total debt 784.2 1,172.2  
Senior Notes | $600 million Senior Notes, due 2024      
Debt Instrument [Line Items]      
Total debt 600.0 600.0  
Less: unamortized debt issuance costs     $ 7.1
Promissory notes and deferred consideration | Notes weighted average maturity 2.3 years and 2.5 years      
Debt Instrument [Line Items]      
Total debt 56.1 73.1  
Foreign bank debt | Debt weighted average maturity 1.4 years and 1.6 years      
Debt Instrument [Line Items]      
Total debt 37.3 42.2  
Obligations under finance leases      
Debt Instrument [Line Items]      
Total debt $ 27.5 $ 30.4