Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Components of net periodic benefit cost:
Service cost	$ 3.5	$ 3.7
Interest cost	8.0	9.5
Expected return on plan assets	(9.7)	(10.1)
Amortization of prior service cost	0.3	0.4
Amortization of net actuarial loss	4.4	0.0
Net periodic benefit cost	6.5	3.5
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Lump Sum Distributions Paid	(4.4)
Components of net periodic benefit cost:
Service cost	3.1	3.3
Interest cost	6.2	6.7
Expected return on plan assets	(7.0)	(7.4)
Amortization of prior service cost	0.3	0.4
Amortization of net actuarial loss		0.0
Net periodic benefit cost	7.0	3.0
Foreign Pension Plan, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	0.4	0.4
Interest cost	1.8	2.8
Expected return on plan assets	(2.7)	(2.7)
Amortization of prior service cost	0.0	0.0
Amortization of net actuarial loss	0.0	0.0
Net periodic benefit cost	$ (0.5)	$ 0.5