Retirement Benefit Plans - Net Periodic Pension Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	2.9	3.4	3.2
Expected return on plan assets	(5.5)	(5.7)	(5.5)
Amortization of actuarial loss	1.5	1.5	2.0
Amortization of prior service cost (credit)	(0.3)	(0.3)	(0.3)
Settlements	1.3	2.6	1.6
Net periodic pension expense	(0.1)	1.5	1.0
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	2.2	2.9
Interest cost	5.6	6.9	6.6
Expected return on plan assets	(9.6)	(10.3)	(8.9)
Amortization of actuarial loss	2.0	4.0	4.2
Amortization of prior service cost (credit)	0.0	0.0	0.8
Amortization of transition liability	0.0	0.0	0.1
Net periodic pension expense	$ (1.8)	$ 2.8	$ 5.7