Retirement Plans - Components of Net Periodic Pension (Credit) Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 0.0	$ 1.2
United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.6	0.7
Expected return on plan assets	(0.8)	(0.9)
Amortization of net actuarial loss	0.1	0.1
Net periodic pension credit	(0.1)	(0.1)
Settlement loss	0.0	1.2
Total pension (credit) cost	(0.1)	1.1
International
Defined Benefit Plan Disclosure [Line Items]
Total pension (credit) cost	$ 0.0	$ 0.0