Pensions and Postretirement Benefits Other Than Pensions Pensions and Postretirement Benefits Other Than Pensions (Schedule ofMultiemployer Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total contributions	$ 5.2	$ 4.8	$ 4.1