Employee Benefit Plans (Amounts Recognized In Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 2.4	$ 1.5
Accrued benefit cost	(132.8)	(122.0)
Net amount recognized	(130.4)	(120.5)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets
Accrued benefit cost	(7.8)	(15.3)
Net amount recognized	$ (7.8)	$ (15.3)