Pension, Post-Retirement and Post-Employment Plans - Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet
Pension and post-retirement benefits	$ 50.8	$ 49.5
Domestic | Pension Plan and SERP
Balance Sheet
Accrued expenses and other current liabilities	0.6	0.5
Pension and post-retirement benefits	21.4	21.0
Accumulated Other Comprehensive Loss
Net actuarial loss	(6.9)	(5.1)
Prior service costs	0.0	0.0
Domestic | Post-retirement Medical Benefits
Balance Sheet
Accrued expenses and other current liabilities	0.6	0.7
Pension and post-retirement benefits	8.6	8.3
Accumulated Other Comprehensive Loss
Net actuarial loss	(0.6)	(0.3)
Prior service costs	0.0
Foreign | Pension Plan and SERP
Balance Sheet
Accrued expenses and other current liabilities	0.8	1.0
Pension and post-retirement benefits	19.8	18.0
Accumulated Other Comprehensive Loss
Net actuarial loss	(2.1)	(1.8)
Prior service costs	0.0	0.0
Foreign | Post-retirement Medical Benefits
Balance Sheet
Accrued expenses and other current liabilities	0.0	0.0
Pension and post-retirement benefits	0.1	1.3
Accumulated Other Comprehensive Loss
Net actuarial loss	(0.7)	$ (0.8)
Prior service costs	$ 1.4