Long-Term and Other Debt - Loss on Extinguishment and Modification of Debt (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Debt Disclosure [Abstract]
Repurchase and cancellation of principal balance at discount	$ 0.0	$ 26.0	$ 0.0	$ 26.0
Unamortized debt discount and deferred financing costs	0.0	(0.8)	(25.8)	(0.8)
Third party debt issuance fees	0.0	0.0	(3.9)	0.0
Total loss on extinguishment and modification of debt	$ 0.0	$ 25.2	$ (29.7)	$ 25.2