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Other Current Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other current assets    
Prepaid expenses $ 77.1 $ 59.0
Other investments 23.6 18.3
Other receivables 14.3 16.5
Income taxes receivable 5.5 23.7
Marketable securities 2.9 3.3
Contract assets 1.0 0.0
Deferred financing fees 0.6 0.6
CFPB escrow deposit 0.0 13.9
Other 11.5 10.9
Total other current assets $ 136.5 $ 146.2