Pension, Post-Retirement and Post-Employment Plans - Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Balance Sheet
Pension and post-retirement benefits	$ 49.5	$ 56.3
Domestic | Pension Plan and SERP
Balance Sheet
Other assets	0.0	0.0
Accrued expenses and other current liabilities	0.5	1.1
Pension and post-retirement benefits	21.0	25.5
Accumulated Other Comprehensive Loss
Net actuarial (loss) gain	(5.1)	(7.0)
Prior service (costs) credits	0.0	(0.1)
Domestic | Post-retirement Medical Benefits
Balance Sheet
Other assets	0.0	0.0
Accrued expenses and other current liabilities	0.7	0.6
Pension and post-retirement benefits	8.3	9.1
Accumulated Other Comprehensive Loss
Net actuarial (loss) gain	(0.3)	(0.8)
Foreign | Pension Plan and SERP
Balance Sheet
Other assets	0.0	3.6
Accrued expenses and other current liabilities	1.0	0.7
Pension and post-retirement benefits	18.0	18.2
Accumulated Other Comprehensive Loss
Net actuarial (loss) gain	(1.8)	(2.4)
Prior service (costs) credits	0.0	0.0
Foreign | Post-retirement Medical Benefits
Balance Sheet
Other assets	0.0	0.0
Accrued expenses and other current liabilities	0.0	0.0
Pension and post-retirement benefits	1.3	0.9
Accumulated Other Comprehensive Loss
Net actuarial (loss) gain	$ (0.8)	$ (0.4)