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Debt (Schedule of Deferred Financing Costs) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Bank credit facilities [Member]
  
Deferred Finance Costs, Beginning Balance $ 3.0
Deferred financing costs, additions 2.1
Deferred financing costs, reductions (4.1)
Deferred Finance Costs, End Balance 1.0
Convertible notes [Member]
  
Deferred Finance Costs, Beginning Balance 3.6
Deferred financing costs, reductions (1.0)
Deferred Finance Costs, End Balance $ 2.6