CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 12.1	$ 6.4
Other comprehensive income (loss), net of tax
Deferred commodity contracts hedging losses, net of tax of $0 and $0.1 million, respectively	0	0.2
Other comprehensive income (loss), net of tax	0	0.2
Comprehensive income	$ 12.1	$ 6.6