Accounting Policies and Basis of Presentation - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of reportable segments | segment				1
Shares received per parent share			1
Loss on debt extinguishment	$ 0.0	$ 0.0		$ 0.0	$ 76.3
Loss from continuing operations	(0.7)	5.0		35.3	197.7
Tax expense	$ (2.3)	$ (0.7)		(3.8)	(108.4)
Net cash used for operating activities of continuing operations				(44.4)	(178.8)
Net cash used for operating activities of discontinued operations				$ 0.2	$ 47.7
Revisions
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Loss on debt extinguishment			$ 4.3
Overstated income tax expense			0.8
Loss from continuing operations			3.5
Comprehensive loss			2.6
Retained earnings adjustment			2.6
Net cash used for operating activities of continuing operations			16.2
Net cash used for operating activities of discontinued operations			$ 16.2