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Debt (Schedule of Deferred Financing Costs) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Bank credit facilities [Member]
  
Deferred Finance Costs, Beginning Balance $ 3.0
Deferred financing costs, additions 2.0
Deferred financing costs, reductions (3.2)
Deferred Finance Costs, End Balance 1.8
Convertible notes [Member]
  
Deferred Finance Costs, Beginning Balance 3.6
Deferred financing costs, reductions (0.5)
Deferred Finance Costs, End Balance $ 3.1