Pension and Other Postretirement Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 0	$ 0.1
Interest cost	7.0	7.8
Expected return on plan assets	(7.5)	(6.8)
Net periodic benefit (income) expense	(0.5)	1.1
Amortization of deferred (gains) loss, net	0.1	0.1
Net pension (income) expense	(0.4)	1.2
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0.1
Interest cost	0	0.3
Amortization of deferred (gains) loss, net	(1.4)	(0.5)
Net pension (income) expense	$ (1.4)	$ (0.1)