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Basis of Presentation and Recently Issued Accounting Pronouncements - Correction of Errors (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative	$ 78.8	$ 74.2	$ 160.0	$ 136.7
Direct operating	168.9	159.2	338.0	317.9
Restricted cash and cash equivalents	10.3		10.3		$ 7.0
Net cash provided by investing activities			(99.8)	(73.3)
Cash and cash equivalents	$ 12.0	55.1	$ 12.0	55.1	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		1.8		3.0
Direct operating		(1.8)		(3.0)
Restricted cash and cash equivalents					(12.4)
Net cash provided by investing activities				(3.5)
Cash and cash equivalents		$ 12.5		$ 12.5	$ 12.4	$ 9.0