Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Comprehensive Income (Parenthetical)

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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Statement of Other Comprehensive Income [Abstract]    
Change in fair value of derivative instruments, tax $ 0.2 $ (0.7)
Reclassification of settled contracts, tax $ 0.9 $ 2.0