Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible assets
Total intangible assets	$ 4.8	$ 8.2
Intangible assets, net	1.2	1.4
Deferred financing costs	41.7	41.7
Less: Accumulated amortization-deferred financing costs	(36.9)	(35.6)
Deferred financing costs, net	4.8	6.1
Goodwill — Europe	2.4	2.4
Equity in net assets of affiliates	7.7	0.0
Supply agreement(1)	11.5	14.6
Restricted Cash and Investments, Noncurrent	16.4	20.2	$ 20.0	$ 20.0
Other	36.4	38.5
Total	80.4	83.2
Patents [Member]
Intangible assets
Total intangible assets	2.0	2.0
Less: Accumulated amortization-patents	1.9	(1.9)
Favorable Leasehold Interests [Member]
Intangible assets
Total intangible assets	2.8	6.2
Less: Accumulated amortization-patents	$ 1.7	$ (4.9)