Other Income (Expense) - Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Other Income (Expense) - Net
Merger related expenses (1)	$ (7.2)
Retiree health care expenses related to previously owned businesses	(2.1)	(2.6)
Expenses related to previously owned businesses	(1.0)	(1.6)
Equity in affiliated companies	0.5	(0.9)
Other - net	0.2	(0.7)
Other income (expense) - net	$ (9.6)	$ (5.8)