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STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 292.0us-gaap_NetIncomeLoss $ 292.6us-gaap_NetIncomeLoss $ 280.3us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax      
Deferred commodity contracts hedging losses, net of tax of $0.0, $0.8 and $0.7, respectively 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 1.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 1.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Comprehensive income $ 292.0us-gaap_ComprehensiveIncomeNetOfTax $ 293.9us-gaap_ComprehensiveIncomeNetOfTax $ 281.5us-gaap_ComprehensiveIncomeNetOfTax