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Supplemental Financial Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Supplemental Statement of Operations Information    
Investment gains $ 1.2 $ 0.3
Derivative financial instruments gains (losses) 3.8 (3.7)
Non-operating foreign currency losses (4.7) (4.8)
Other income (expense) $ 0.3 $ (8.2)