Retirement Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
U.S. and Puerto Rico [Member]
Amounts recognized in consolidated balance sheet:
Prepaid pension		$ 27.0
Short-term accrued benefit liability	(1.0)	(0.7)
Long-term accrued benefit liability	(13.9)	(8.5)
Net amount recognized	(14.9)	17.8
Foreign-based defined benefit plans [Member]
Amounts recognized in consolidated balance sheet:
Prepaid pension	4.3	3.0
Long-term accrued benefit liability	(34.3)	(23.5)
Net amount recognized	$ (30.0)	$ (20.5)