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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Service cost	$ 1.6	$ 2.2	$ 5.5	$ 6.4
Interest cost	7.0	10.6	23.2	31.8
Net amortization of prior service gains	(2.6)	(0.9)	(7.5)	(2.6)
Net amortization of plan net actuarial losses	0.1	0.7	5.4	2.2
Total	6.1	12.6	26.6	37.8
Segment, Continuing Operations [Member]
Total	4.4	8.5	17.5	25.3
Segment, Discontinued Operations [Member]
Total	$ 1.7	$ 4.1	$ 9.1	$ 12.5