Pension and Post-Retirement Plans - Components of Net Periodic Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Domestic | Pension & SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Interest cost on the projected benefit obligation	2.2	2.5	6.6	7.6
Expected return on plan assets	(2.5)	(2.9)	(7.6)	(8.7)
Amortization of prior service cost	0.0	0.0	0.0	0.0
Amortization of actuarial net loss	0.0	0.0	0.0	0.0
Net periodic (benefit) cost	(0.3)	(0.4)	(1.0)	(1.1)
Domestic | Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost on the projected benefit obligation	0.1	0.1	0.3	0.3
Net periodic (benefit) cost	0.1	0.1	0.3	0.3
Foreign | Pension & SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.4	1.4	1.3
Interest cost on the projected benefit obligation	0.6	0.8	1.8	2.3
Expected return on plan assets	(0.5)	(0.6)	(1.5)	(1.9)
Amortization of prior service cost	0.0	0.1	0.1	0.4
Amortization of actuarial net loss	0.0	0.0	0.1	0.0
Net periodic (benefit) cost	0.6	0.7	1.9	2.1
Foreign | Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.1	0.0
Interest cost on the projected benefit obligation	0.1	0.1	0.3	0.2
Net periodic (benefit) cost	$ 0.1	$ 0.1	$ 0.4	$ 0.2