CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 13.0	$ 12.1
Other comprehensive income (loss), net of tax
Deferred commodity contracts hedging losses reclassified in net income, net of tax of $0.2 and $0.2, respectively	0.3	0.4
Deferred commodity contracts hedging gains (losses), net of tax of $0.1 and ($0.3), respectively	0.2	(0.4)
Other comprehensive income (loss), net of tax	0.5	0
Comprehensive income (loss)	$ 13.5	$ 12.1