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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Service cost	$ 1.7	$ 1.9	$ 3.4	$ 3.9
Interest cost	6.7	8.1	13.4	16.2
Net amortization of prior service gains	(2.6)	(2.9)	(5.2)	(4.9)
Net amortization of plan net actuarial losses	2.7	2.8	5.4	5.3
Total	8.5	9.9	17.0	20.5
Segment, Continuing Operations [Member]
Total	5.4	6.4	10.8	13.1
Segment, Discontinued Operations [Member]
Total	$ 3.1	$ 3.5	$ 6.2	$ 7.4