Pensions and Postretirement Benefits Other Than Pensions (Schedule of Company's Postretirement Plans Funded Status) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Liabilities of Assets Held-for-sale	$ 0	$ (176.2)
Postretirement [Member]
Plan assets less than benefit obligations	(919.9)	(883.0)
Accrued compensation and benefits	(71.8)	(75.3)
Postemployment and other benefit liabilities	(848.1)	(794.3)
Liabilities of Assets Held-for-sale	$ 0	$ (13.4)