Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plan, Defined Benefit [Member]
Components of net periodic benefit cost:
Service cost	$ 13.1	$ 15.4	$ 21.5
Interest cost	26.6	45.6	98.3
Expected return on plan assets	(29.8)	(62.6)	(152.0)
Amortization of prior service cost	1.7	2.8	3.5
Defined Benefit Plan, Future Amortization of Gain (Loss)	(14.5)	(31.1)
Defined Benefit Plan, Amortization of Gains (Losses)			55.6
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	15.8	456.4	32.7
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0.0	0.0	0.0
Defined Benefit Plan, Special Termination Benefits	0.0	0.0	0.0
Net periodic benefit cost from discontinued operations	0.0	0.0	(8.0)
Net periodic benefit cost	41.9	488.7	51.6
International Plans [Member]
Components of net periodic benefit cost:
Service cost	1.4	2.2	2.4
Interest cost	10.5	12.3	17.7
Expected return on plan assets	(10.3)	(16.7)	(23.7)
Amortization of prior service cost	0.1	0.1	0.1
Defined Benefit Plan, Future Amortization of Gain (Loss)	(3.4)	(5.2)
Defined Benefit Plan, Amortization of Gains (Losses)			5.3
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	10.8	4.8	0.8
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	(0.1)	0.6	0.0
Defined Benefit Plan, Special Termination Benefits	0.0	0.6	0.0
Net periodic benefit cost from discontinued operations	0.0	0.0	0.4
Net periodic benefit cost	$ 15.8	$ 9.1	$ 3.0