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Other Current Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 53.6 $ 43.9
Income taxes receivable 17.2 5.4
Other investments 14.2 29.5
CFPB escrow deposit 13.9 0.0
Marketable securities 3.2 3.3
Deferred financing fees 0.5 0.5
Other 15.0 7.3
Total other current assets $ 117.6 $ 89.9