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Debt (Schedule of Deferred Financing Costs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Deferred Finance Costs, Beginning Balance $ 6.6 $ 14.6
Deferred financing costs, additions 2.2 9.2
Deferred financing costs, reductions (7.2) (17.2)
Deferred Finance Costs, End Balance 1.6 6.6
Bank credit facilities [Member]
    
Deferred Finance Costs, Beginning Balance 3.0 2.4
Deferred financing costs, additions 2.2 9.2
Deferred financing costs, reductions (5.2) (8.6)
Deferred Finance Costs, End Balance 0 3.0
Convertible notes [Member]
    
Deferred Finance Costs, Beginning Balance 3.6 5.5
Deferred financing costs, additions 1.8  
Deferred financing costs, reductions (0.2) (1.9)
Deferred Finance Costs, End Balance 1.6 3.6
DOE Loan Guarantee application [Member]
    
Deferred Finance Costs, Beginning Balance   6.7
Deferred financing costs, additions (1.8)  
Deferred financing costs, reductions (1.8) (6.7)
Deferred Finance Costs, End Balance $ 0