Pensions and Postretirement Benefits Other than Pensions (Components of Net Periodic Postretirement Benefit Cost) (Details) (Postretirement Benefit Costs [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Service cost	$ 1.7	$ 2.0
Interest cost	6.7	8.1
Net amortization of prior service gains	(2.6)	(2.0)
Net amortization of plan net actuarial losses	2.7	2.5
Total	8.5	10.6
Segment, Continuing Operations [Member]
Total	5.4	6.7
Segment, Discontinued Operations [Member]
Total	$ 3.1	$ 3.9