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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other comprehensive income (loss), net of tax        
Deferred commodity contracts hedging losses reclassified in net income $ 0.1 $ 0.1 $ 0.6 $ 0.4
Deferred commodity contracts hedging gains (losses) $ 0.1 $ (0.2) $ (0.1) $ (0.3)