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Basis of Presentation and Recently Issued Accounting Pronouncements - Correction of Errors (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative	$ 84.6	$ 66.8	$ 244.6	$ 203.5
Direct operating	188.2	169.9	526.2	487.8
Restricted cash and cash equivalents	7.1		7.1		$ 7.0
Net cash provided by investing activities			(289.1)	(248.1)
Cash and cash equivalents	$ 19.1	53.3	$ 19.1	53.3	24.0	$ 24.7
Adjustments \| Historical Mapping of Entities Related to Spin-Off
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative				3.0
Direct operating				(3.0)
Restricted cash and cash equivalents					(12.4)
Net cash provided by investing activities				(7.6)
Cash and cash equivalents		$ 1.4		$ 1.4	$ 12.4	$ 9.0