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Debt (Schedule of Deferred Financing Costs) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014
Deferred Finance Costs, Beginning Balance	$ 1.6	$ 6.6
Deferred financing costs, additions	0.7leu_DeferredFinancingCostsAdditions	2.2leu_DeferredFinancingCostsAdditions
Deferred financing costs, reductions	(1.6)leu_DeferredFinancingCostsAmortization	(7.2)leu_DeferredFinancingCostsAmortization
Deferred Finance Costs, End Balance	0.7	1.6	0.7
Convertible notes, non-current [Member]
Deferred Finance Costs, Beginning Balance	0	3.6
Deferred financing costs, additions	0	(1.8)
Deferred financing costs, reductions	0	(1.8)
Deferred Finance Costs, End Balance	0	0
Bank credit facilities [Member]
Deferred Finance Costs, Beginning Balance	0	3.0
Deferred financing costs, additions	0	2.2
Deferred financing costs, reductions	0	(5.2)
Deferred Finance Costs, End Balance	0	0
Convertible notes [Member]
Deferred Finance Costs, Beginning Balance	1.6
Deferred financing costs, additions	0	1.8
Deferred financing costs, reductions	(1.6)	(0.2)
Deferred Finance Costs, End Balance	0	1.6
PIK toggle notes [Member]
Deferred Finance Costs, Beginning Balance			0.7
Deferred financing costs, additions	0.7
Deferred financing costs, reductions			0.1
Deferred Finance Costs, End Balance	$ 0.7		$ 0.7