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Other Assets (Schedule of Deferred Financing Costs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deferred Finance Costs, End Balance $ 3.6 $ 12.2
Bank credit facilities [Member]
    
Deferred Finance Costs, Beginning Balance 2.4 7.4
Deferred financing costs, additions 9.2 0.5
Deferred financing costs, reductions (8.6) (5.5)
Deferred Finance Costs, End Balance 3.0 2.4
Convertible notes [Member]
    
Deferred Finance Costs, Beginning Balance 5.5 8.1
Deferred financing costs, reductions (1.9) (2.6)
Deferred Finance Costs, End Balance 3.6 5.5
DOE Loan Guarantee application [Member]
    
Deferred Finance Costs, Beginning Balance 6.7 2.5
Deferred financing costs, additions   4.2
Deferred financing costs, reductions (6.7)  
Deferred Finance Costs, End Balance   6.7
Deferred financing costs [Member]
    
Deferred Finance Costs, Beginning Balance 12.2 10.6
Deferred financing costs, additions   4.2
Deferred financing costs, reductions (8.6) (2.6)
Deferred Finance Costs, End Balance $ 3.6 $ 12.2