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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement of Comprehensive Income [Abstract]    
Change in fair value of derivative instruments, tax $ 0 $ (0.9)
Reclassification of settled contracts, tax $ 0 $ 1.2