Defined Benefit Pension Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 0.8	$ 0.9
Interest cost	3.2	3.7
Expected return on plan assets	(4.1)	(4.3)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.1	0.1
Defined Benefit Plan, Amortization of Gains (Losses)	1.8	1.7
Net periodic pension cost	1.8	2.1
Pension expense	1.8	2.1
Pension Contributions	0.4
Anticipated Pension Contributions	$ 1.2