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FAIR VALUE MEASUREMENTS - Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Credit Agreement | Term Loan      
FAIR VALUE MEASUREMENTS      
Debt $ 502.5   $ 151.9
Credit Agreement | Term Loan B | Carrying Value      
FAIR VALUE MEASUREMENTS      
Debt     280.0
Credit Agreement | Revolving Credit Facility | Carrying Value      
FAIR VALUE MEASUREMENTS      
Debt     5.0
Outstanding amount 0.0    
Seller notes | Carrying Value      
FAIR VALUE MEASUREMENTS      
Debt 3.8   5.9
Recurring basis | Level 1 | Fair Value | Other current assets      
FAIR VALUE MEASUREMENTS      
Money market funds 2.3   3.3
Recurring basis | Level 3 | Credit Agreement | Term Loan | Fair Value      
FAIR VALUE MEASUREMENTS      
Debt 500.6   149.4
Recurring basis | Level 3 | Credit Agreement | Term Loan B | Fair Value      
FAIR VALUE MEASUREMENTS      
Debt     283.5
Recurring basis | Level 3 | Credit Agreement | Revolving Credit Facility | Fair Value      
FAIR VALUE MEASUREMENTS      
Debt     4.9
Interest rate swap agreements | Cash flow hedges      
FAIR VALUE MEASUREMENTS      
Notional amount of derivative instrument $ 325.0 $ 325.0 $ 0.0
Annual reduction in notional amount of derivative   $ 12.5