Investments in Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Revenue	$ 69.6	$ 131.5
Gross profit	23.0	7.0
Net income (loss)	7.8	(24.6)
Impairment of Magnetation investment	$ 0.0	256.3
Magnetation LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.90%
Impairment of Magnetation investment		256.3
Cost of Sales [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 2.9	1.8
Other Nonoperating Income (Expense) [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments		$ (16.3)