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Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Operating lease liabilities $ 24.6  
Reserve for uncertain tax positions 19.8 $ 19.1
Accrued litigation settlement 71.6 17.0
Deferred income 17.4 15.8
Other postretirement benefits 10.5 10.3
Employee benefits 6.9 7.1
Insurance claims and expenses 9.0 8.1
Deferred payment obligation 9.7 9.6
Accrued development costs 9.0 7.5
Other 6.9 9.9
Total $ 185.4 $ 104.4