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Other Income (Expense), Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Components of other income (expense), net [Line Items]        
Interest income $ 0.1 $ 0.1 $ 0.2 $ 0.3
Unrealized gains (losses) on financial derivatives 1.6 [1] (0.1) [1] 1.1 [1] 1.1 [1]
Realized gains on investments 0.3 0 1.1 0.1
Distribution from bankruptcy trust 0.6 [2] 0 0.6 [2] 0
All other, net 0.3 0.4 0.1 0.7
Other non-operating income, net 2.9 0.4 3.1 2.2
Treasury Stock
       
Components of other income (expense), net [Line Items]        
Distribution from bankruptcy trust     $ (0.6)  
[1] See “Hedges Relating to the Convertible Notes” in Note 9 for discussion of such instruments.
[2] See Note 11 for discussion of the distribution.