Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Mar. 31, 2021
Operating Loss Carryforwards [Line Items]
Income tax expense	$ (0.1)	$ (1.4)	$ (3.8)	$ (3.7)
Operating loss carryforwards, US	101.5		101.5
Reduced deferred tax asset carryforward					$ 69.6
CARES Act
Operating Loss Carryforwards [Line Items]
Deferred employer payroll tax obligation	11.0		11.0
CARES Act | Accrued Liabilities
Operating Loss Carryforwards [Line Items]
Deferred employer payroll tax obligation	5.5		5.5
CARES Act | Other Liabilities
Operating Loss Carryforwards [Line Items]
Deferred employer payroll tax obligation	$ 5.5		$ 5.5
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards					170.3
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Foreign operating loss carryforward					$ 112.6
Foreign Tax Authority | Energy Segment
Operating Loss Carryforwards [Line Items]
Foreign operating loss carryforward						$ 29.3