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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other comprehensive income (loss), net of tax    
Deferred commodity contracts hedging losses reclassified in net income $ 0.2 $ 0.2
Deferred commodity contracts hedging gains (losses) $ 0.1 $ (0.3)