Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
U.S. and Puerto Rico [Member]
Components of net pension expense
Service cost	$ 11.4	$ 10.9	$ 12.3
Interest cost	13.0	11.5	10.6
Expected return on plan assets	(21.9)	(18.1)	(16.4)
Curtailment			0.4
Amortization of prior service cost		(0.1)	0.1
Amortization of unrecognized actuarial loss	6.2	2.4	4.1
Net periodic benefit cost	8.7	6.6	11.1
Foreign-based defined benefit plans [Member]
Components of net pension expense
Service cost	16.8	14.6	13.7
Interest cost	7.3	6.7	6.8
Expected return on plan assets	(9.6)	(8.0)	(8.2)
Amortization of prior service cost	(0.8)	(0.7)	(0.7)
Amortization of unrecognized actuarial loss	1.2	1.2	1.9
Net periodic benefit cost	$ 14.9	$ 13.8	$ 13.5