Pensions and Postretirement Benefits (Details 11) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in projected benefit obligations
Projected benefit obligation at beginning of year	$ 326.6	$ 331.5
Service cost	1.1	1.1	1.4
Interest cost	15.6	17.4	19.6
Amendments	(2.4)	0
Actuarial (gains) losses	0.6	3.7
Foreign currency translation/Other	(0.1)	0.1
Gross benefits paid	(31.0)	(30.4)
Federal subsidy received	3.5	3.2
Projected benefit obligation at end of year	314.0	326.6	331.5
Weighted-Average Assumption used to Determine Benefit Obligations as Of December 31
Discount rate	4.67%	5.29%
Initial health care rate of increase	7.50%	7.50%	7.80%
Ultimate health care rate of increase	5.00%	5.00%	5.00%
Defined benefit plan year that rate reaches ultimate trend rate	2018	2017	2015
Other Postretirement Benefit Plans Defined Benefit [Member]
Change in projected benefit obligations
Service cost	1.1	1.1	1.4
Interest cost	15.7	17.4	19.6
Gross benefits paid	$ 31.0	$ 30.4
Weighted-Average Assumption used to Determine Benefit Obligations as Of December 31
Initial health care rate of increase	7.50%	7.30%	7.80%