Pensions - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Payments for repurchase of common stock				$ 33.8	$ 10.6
Actuarial losses recognized		$ 0.4
Common Stock
Defined Benefit Plan Disclosure [Line Items]
Payments for repurchase of common stock				3.6
U.S. Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer				5.6	5.5
Actuarial losses recognized	$ 1.4		$ 1.7	4.2	5.1
Non-U.S. Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer				1.0	1.1
Estimated future employer contributions in current year				0.4
Actuarial losses recognized	$ 0.2		$ 0.1	$ 0.5	$ 0.5