Non-operating Expense (Details) (USD $) In Millions, unless otherwise specified		1 Months Ended		1 Months Ended
	Dec. 31, 2011	Feb. 28, 2011 6.75% senior subordinated notes due 2015	Dec. 31, 2011 6.75% senior subordinated notes due 2015	Jul. 31, 2010 Senior Secured Credit Facility
Other Non-Operating Expense
Senior subordinated notes redeemed		$ 150
Face value		225
Interest rate (as a percent)	6.75%		6.75%
Call premium (as a percent)		2.25%
Pre-tax charge incurred on call premium		4.9
Amortization of deferred financing cost				$ 6.8