Employee Benefit Plans (Schedule of Accumulated Benefit Obligations in Excess of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 43.3	$ 42.2
Accumulated benefit obligation	36.5	34.6
Fair value of plan assets	0	0
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	26.9	24.6
Accumulated benefit obligation	26.9	24.6
Fair value of plan assets	$ 0	$ 0