Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Number of Participants Domestic Pension Plan	4,100
Number of Participants Postretirement Benefit Plan	2,400
Deferred Compensation Arrangements [Abstract]
Deferred Compensation Liability	$ 90.0	$ 96.0
Deferred Compensation Expense	9.8	7.6	14.1
Deferred Benefit Liability	173.8	178.3
Deferred Benefit Expense	15.0	14.8	12.9
Cash Surrender Value of Life Insurance	150.2	144.9
Deferred Compensation Plan Assets	5.9	13.8
Supplemental Unemployment Benefits [Abstract]
Duration of disability benefits	24 months
Income Replacement Benefit Obligation	0	0
Health and Life Insurance Benefit Obligation	$ 11.3	$ 9.3