Retirement Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Settlements and curtailments	$ 2.6	$ 0.2
United States
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0.0	0.0
Interest cost	2.9	3.0
Expected return on plan assets	(3.8)	(4.1)
Amortization of net actuarial loss	0.4	1.2
Amortization of prior service credit	0.0	0.0
Amortization of transition obligation	0.0	0.0
Net periodic pension cost (credit)	(0.5)	0.1
Settlements and curtailments	2.9	1.7
Total pension cost	2.4	1.8
International
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0.0	0.2
Interest cost	0.6	0.5
Expected return on plan assets	(0.6)	(0.7)
Amortization of net actuarial loss	0.2	0.3
Amortization of prior service credit	0.0	(0.2)
Amortization of transition obligation	0.0	0.1
Net periodic pension cost (credit)	0.2	0.2
Settlements and curtailments		(1.5)
Total pension cost	$ 0.2	$ (1.3)