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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (in USD)	$ 5.2	$ 4.1	$ 15.9	$ 12.3
Stock-based compensation amortization expense unrecognized (in USD)	$ 23.9		$ 23.9
Average remaining vesting period (in years)			2 years
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period (in shares)	30,000	26,000	1,200,000	1,200,000
Award vesting period (in years)			3 years
Average grant date fair value (usd per share)			$ 11.98	$ 10.41
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period (in shares)	0	0	604,000	589,000
Award vesting period (in years)			3 years
Average grant date fair value (usd per share)			$ 11.75	$ 10.82
2021 Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	9,000,000		9,000,000
Number of shares available for grant (in shares)	7,400,000		7,400,000
2016 Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction of shares available to issue for shares granted after 2020 year end (in shares)			1