Retirement Benefit Plans (Net Periodic Pension Expense) (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]
Interest cost	$ 3.1	$ 3.4	$ 3.6
Expected return on plan assets	(4.3)	(4.4)	(5.0)
Amortization of actuarial loss	2.8	2.3	1.6
Amortization of prior service credit	(0.1)	(0.1)	0
Net periodic pension benefit expense (income)	1.5	1.2	0.2
Non-U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.2	0.2	0.2
Expected return on plan assets	(0.2)	(0.3)	(0.3)
Amortization of actuarial loss	0.1	0	0
Net periodic pension benefit expense (income)	0.1	(0.1)	(0.1)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.1
Interest cost	0.1	0.2	0.2
Amortization of actuarial loss	0.1	0	0.1
Amortization of prior service credit	(0.2)	(0.2)	(0.3)
Plan amendments	0	0	(0.9)
Net periodic pension benefit expense (income)	$ 0.1	$ 0.1	$ (0.8)