Employee Benefits (Other Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	4.28%	5.23%
Equity based compensation expense	$ 3.8	$ 15.5	$ 31.2
Management [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Equity based compensation expense	3.8	0.6	6.0
Executive Supplemental Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate, benefit obligations	8.25%
Pension and postretirement	2.6	13.2
Pension and postretirement benefit expense	0.2	0.2	2.3
Performance Incentive Awards [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Performance and sales incentive expense	$ 12.3	$ 13.9	$ 14.6