Retirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss	$ 3.1	$ 7.0	$ 1.6
Amortization of actuarial loss	(2.8)	(2.3)	(1.6)
Current year prior service credit	0	0	(0.2)
Amortization of prior service credit	0.1	0.1	0
Total recognized in other comprehensive income (loss)	0.4	4.8	(0.2)
Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss	0	1.2	0.3
Amortization of actuarial loss	(0.1)	(0.1)	(0.1)
Total recognized in other comprehensive income (loss)	(0.1)	1.1	0.2
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial loss	0.3	0	0.6
Amortization of actuarial loss	(0.1)	0	(0.1)
Amortization of prior service credit	0.2	0.2	0.3
Total recognized in other comprehensive income (loss)	$ 0.4	$ 0.2	$ 0.8