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, 2012	Mar. 31, 2011
Service cost	$ 25.3	$ 24.1
Interest cost	41.3	47.6
Expected return on plan assets	(43.3)	(55.9)
Net amortization of prior service costs	1.4	1.4
Net amortization of plan net actuarial losses	14.9	13.7
Net periodic pension benefit cost	39.6	30.9
Net curtailment and settlement (gains) losses	0.1	5.8
Total	39.7	36.7
Segment, Continuing Operations [Member]
Total	36.8	36.5
Segment, Discontinued Operations [Member]
Total	$ 2.9	$ 0.2