Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2018 USD ($)
United States Federal and Non-United States
Income Tax Contingency [Line Items]
2019	$ 6.1
2020	3.1
2021	5.3
2022	4.5
2023	1.9
Thereafter	22.2
No expirations	367.0
Total net operating loss carryforwards	410.1
United States State
Income Tax Contingency [Line Items]
2019	3.9
2020	0.2
2021	3.7
2022	4.0
2023	9.6
Thereafter	153.2
No expirations	0.0
Total net operating loss carryforwards	$ 174.6