Employee Benefit Plans (Schedule of Net Periodic Benefit Cost Recognized) (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]
Net (gain) loss to be amortized over next fiscal year	$ 2.4
Prior service cost to be amortized over next fiscal year	0.1
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1.7	1.4	1.3
Interest cost	1.8	1.9	1.7
Amortization of prior service cost	0	0	0.4
Amortization of net loss (gain)	1.2	0.1	0
Net priodic benefit cost	4.7	3.4	3.4
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.4	0.2	0.2
Interest cost	1.1	0.8	0.7
Amortization of prior service cost	0.1	0	0
Amortization of net loss (gain)	2.9	0.5	0
Net priodic benefit cost	$ 4.5	$ 1.5	$ 0.9