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		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Service cost	$ 2.1	$ 2.5	$ 4.2	$ 4.9
Interest cost	10.8	12.9	21.2	25.8
Net amortization of prior service costs	(0.8)	(1.0)	(1.7)	(1.8)
Net amortization of net actuarial losses	0.8	4.1	1.5	8.3
Total	12.9	18.5	25.2	37.2
Segment, Continuing Operations [Member]
Total	8.5	10.6	16.4	21.6
Segment, Discontinued Operations [Member]
Total	$ 4.4	$ 7.9	$ 8.8	$ 15.6