Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Number of Participants Domestic Pension Plan	4,200
Number of Participants Postretirement Benefit Plan	2,600
Deferred Compensation Arrangements [Abstract]
Deferred Compensation Liability	$ 96.0	$ 104.2
Deferred Compensation Expense	7.6	14.1	11.6
Deferred Benefit Liability	178.3	177.1
Deferred Benefit Expense	14.8	12.9	12.0
Cash Surrender Value of Life Insurance	144.9	123.2
Deferred Compensation Plan Assets	13.8	16.5
Supplemental Unemployment Benefits [Abstract]
Duration of disability benefits	24
Income Replacement Benefit Obligation	0	0
Health and Life Insurance Benefit Obligation	$ 9.3	$ 10.2