Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Intangible assets
Total intangible assets	$ 8.2	$ 8.2
Intangible assets, net	2.7	2.8
Deferred financing costs	105.8	105.8
Less: Accumulated amortization-deferred financing costs	(87.4)	(86.3)
Deferred financing costs, net	18.4	19.5
Goodwill - Europe	2.6	2.7
Equity in net assets of affiliates	3.7	3.2
Customer Supply Agreement	25.6	29.3
Restricted Cash and Investments, Noncurrent	19.9	19.9
Deferred Tax Assets, Net, Noncurrent	141.8	162.8
Other	40.7	40.6
Total	255.4	280.8
Patents [Member]
Intangible assets
Total intangible assets	1.9	1.9
Less: Accumulated amortization	(1.6)	(1.6)
Favorable Leasehold Interests [Member]
Intangible assets
Total intangible assets	6.3	6.3
Less: Accumulated amortization	$ (3.9)	$ (3.8)