Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Intangible assets
Total intangible assets	$ 8.2	$ 8.2
Intangible assets, net	2.8	3.2
Deferred financing costs	105.8	101.2
Less: Accumulated amortization-deferred financing costs(1)	(86.3)	(79.5)
Deferred financing costs, net	19.5	21.7
Goodwill — Europe	2.7	2.9
Equity in net assets of affiliates	3.2	1.9
Customer supply agreement(2)	29.3	34.3
Restricted Cash and Investments, Noncurrent	19.9	19.9
Non-current deferred tax assets	162.8	0.0
Other	40.6	39.7
Total	280.8	123.6
Patents [Member]
Intangible assets
Total intangible assets	1.9	1.9
Less: Accumulated amortization-patents	1.6	(1.5)
Favorable Leasehold Interests [Member]
Intangible assets
Total intangible assets	6.3	6.3
Less: Accumulated amortization-patents	$ 3.8	$ (3.5)