Pensions and Postretirement Benefits Other Than Pensions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Discount rate 1/1-6/6 [Member] | U.S. Plans [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.67%	5.90%	5.67%	5.90%
Discount rate 1/1-6/6 [Member] | U.K Plans [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.81%	5.88%	5.81%	5.88%
Discount rate 1/1-6/6 [Member] | Other Plans [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.20%	5.75%	5.20%	5.75%
Discount Rate 6/7-9/30 [Member] | U.S. Plans [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.63%	5.90%	5.63%	5.90%
Discount Rate 6/7-9/30 [Member] | U.K Plans [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.81%	5.88%	5.81%	5.88%
Discount Rate 6/7-9/30 [Member] | Other Plans [Member]
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.20%	5.75%	5.20%	5.75%
U.S. Plans [Member]
Net periodic benefit cost for pensions
Service cost	12.4	11.6	36.8	34.7
Interest cost	42.8	42.1	128.4	126.4
Expected return on plan assets	(52.5)	(46.9)	(157.2)	(140.7)
Amortization of prior service cost	1.5	1.8	4.5	5.3
Amortization of actuarial loss	15.3	29.2	44.1	87.6
Gross periodic benefit cost (income)	19.5	37.8	56.6	113.3
Settlement loss	0.2		0.4
Curtailment loss	0		1.4
Net periodic benefit cost (income)	19.7	37.8	58.4	113.3
Termination benefit charge			4.0
Weighted average assumptions used to determine net periodic benefit cost
Expected long-term rate of return on assets	8.25%	8.75%	8.25%	8.75%
Rate of compensation increase	4.10%	4.10%	4.10%	4.10%
U.K Plans [Member]
Net periodic benefit cost for pensions
Service cost	4.3	3.9	12.9	11.6
Interest cost	10.5	9.7	31.7	29.0
Expected return on plan assets	(15.4)	(13.2)	(46.3)	(39.1)
Amortization of prior service cost	(0.1)	(0.1)	(0.4)	(0.4)
Amortization of actuarial loss		0.7		2.0
Gross periodic benefit cost (income)	(0.7)	1.0	(2.1)	3.1
Curtailment loss		0.1		0.1
Net periodic benefit cost (income)	(0.7)	1.1	(2.1)	3.2
Termination benefit charge			0.7
Weighted average assumptions used to determine net periodic benefit cost
Expected long-term rate of return on assets	8.25%	8.50%	8.25%	8.50%
Rate of compensation increase	3.75%	3.75%	3.75%	3.75%
Other Plans [Member]
Net periodic benefit cost for pensions
Service cost	1.9	1.2	5.6	3.6
Interest cost	2.1	1.8	6.4	5.3
Expected return on plan assets	(2.1)	(1.7)	(6.4)	(5.2)
Amortization of prior service cost	0.1		0.3	0.1
Amortization of actuarial loss	0.7	0.3	2.0	1.1
Gross periodic benefit cost (income)	2.7	1.6	7.9	4.9
Net periodic benefit cost (income)	2.7	1.6	7.9	4.9
Weighted average assumptions used to determine net periodic benefit cost
Expected long-term rate of return on assets	8.08%	8.32%	8.08%	8.32%
Rate of compensation increase	3.42%	3.38%	3.42%	3.38%