Pensions and Postretirement Benefits Other Than Pensions (Schedule of Net Periodic Postretirement Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Postretirement Benefit Costs [Member]	Dec. 31, 2010 Postretirement Benefit Costs [Member]	Dec. 31, 2009 Postretirement Benefit Costs [Member]	Dec. 31, 2011 Segment, Continuing Operations [Member] Postretirement Benefit Costs [Member]	Dec. 31, 2010 Segment, Continuing Operations [Member] Postretirement Benefit Costs [Member]	Dec. 31, 2009 Segment, Continuing Operations [Member] Postretirement Benefit Costs [Member]	Dec. 31, 2011 Segment, Discontinued Operations [Member] Postretirement Benefit Costs [Member]	Dec. 31, 2010 Segment, Discontinued Operations [Member] Postretirement Benefit Costs [Member]	Dec. 31, 2009 Segment, Discontinued Operations [Member] Postretirement Benefit Costs [Member]
Service cost		$ 8.4	$ 8.9	$ 9.0
Interest cost		42.0	48.1	55.8
Prior service gains, net amortization of	(5.5)	(3.5)	(3.4)	(3.2)
Plan net actuarial losses, net amortization of	8.5	1.6	11.0	11.6
Net periodic pension benefit cost		48.5	64.6	73.2
Net curtailment and settlement (gains) losses		(10.1)	0	(0.5)
Net periodic benefit cost after net curtailment and settlement (gains) losses		$ 38.4	$ 64.6	$ 72.7	$ 20.9	$ 39.4	$ 43.9	$ 17.5	$ 25.2	$ 28.8