Pensions and Postretirement Benefits Other than Pensions (Components of Net Periodic Postretirement Benefit Cost) (Details) (Postretirement Benefit Costs [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Service cost	$ 2.2	$ 1.8	$ 6.4	$ 6.7
Interest cost	10.6	10.1	31.8	35.9
Net amortization of prior service gains	(0.9)	(0.7)	(2.6)	(2.5)
Net amortization of net actuarial losses	0.7	0	2.2	8.3
Total	12.6	11.2	37.8	48.4
Segment, Continuing Operations [Member]
Total	8.5	7.3	25.3	29.5
Segment, Discontinued Operations [Member]
Total	$ 4.1	$ 3.9	$ 12.5	$ 18.9