Pensions and Postretirement Benefits Other than Pensions (Components of the Company's Pension-Related Costs) (Details) (Pension Cost [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Service cost	$ 23.1	$ 25.3
Interest cost	39.2	41.3
Expected return on plan assets	(42.0)	(43.3)
Net amortization of prior service costs	1.2	1.4
Net amortization of plan net actuarial losses	15.5	14.9
Net periodic pension benefit cost	37.0	39.6
Net curtailment and settlement (gains) losses	0	0.1
Total	37.0	39.7
Segment, Continuing Operations [Member]
Total	34.7	36.8
Segment, Discontinued Operations [Member]
Total	$ 2.3	$ 2.9