Pensions and Postretirement Benefits (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	$ 326.6	$ 331.5
Service cost	1.1	1.1	1.4
Interest cost	15.6	17.4	19.6
Amendments	(2.4)	0
Actuarial (gains) losses	0.6	3.7
Foreign currency translation	(0.1)	0.1
Gross benefits paid	31.0	30.4
Projected benefit obligation at end of year	314.0	326.6	331.5
Weighted Average Assumptions Used to Determine Benefit Obligations as of December 31
Discount rate	4.67%	5.29%
U.S. Plans [Member]
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	3,091.4	2,906.4
Service cost	49.1	46.3	42.9
Interest cost	171.2	168.5	171.9
Amendments	3.2	0.1
Actuarial (gains) losses	238.1	159.2
Curtailments	0.1
Settlements	(1.1)
Special termination benefits	4.0
Gross benefits paid	190.0	189.1
Projected benefit obligation at end of year	3,366.0	3,091.4	2,906.4
Accumulated Benefit Obligation at the End of Year	3,181.3	2,942.9
Weighted Average Assumptions Used to Determine Benefit Obligations as of December 31
Discount rate	5.03%	5.67%
Rate of compensation increase	4.10%	4.10%
U.K. Plans [Member]
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	705.4	678.7
Service cost	17.1	15.6	16.0
Interest cost	42.0	39.0	37.2
Actuarial (gains) losses	108.1	10.4
Participant contributions	0.3	0.3
Special termination benefits	0.7	0.1
Foreign currency translation	(4.8)	(22.6)
Gross benefits paid	14.3	16.1
Projected benefit obligation at end of year	854.5	705.4	678.7
Accumulated Benefit Obligation at the End of Year	718.4	589.8
Weighted Average Assumptions Used to Determine Benefit Obligations as of December 31
Discount rate	5.00%	5.81%
Rate of compensation increase	3.75%	3.75%
Other Plans [Member]
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	149.8	117.8
Service cost	7.4	4.9	3.9
Interest cost	8.4	7.1	6.6
Amendments	0.2	3.1
Actuarial (gains) losses	27.0	15.9
Participant contributions	2.4	2.5
Settlements	(0.7)
Foreign currency translation	(4.1)	3.0
Other	0.5
Gross benefits paid	4.0	4.5
Projected benefit obligation at end of year	186.9	149.8	117.8
Accumulated Benefit Obligation at the End of Year	$ 159.3	$ 120.7
Weighted Average Assumptions Used to Determine Benefit Obligations as of December 31
Discount rate	4.38%	5.19%
Rate of compensation increase	3.43%	3.40%