Stock-based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) performance_period shares	Dec. 31, 2019 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 14.9	$ 15.1	$ 15.7
Tax benefit from compensation expense	$ 1.5	2.4	$ 0.3
Cash used to settle award		$ 1.5
Granted (in shares) \| shares	0	0
Grant date fair value (in dollars per share) \| $ / shares			$ 6.98
Net cash flows associated with stock-based awards	$ 14.4	$ 4.3	$ 50.3
Tax benefit from exercise of stock options	0.4
Intrinsic value on options exercised	2.5	4.3	56.6
Vested in period, fair value	1.9	$ 3.2	5.4
Unrecognized compensation cost	$ 0.1
Period for recognition of compensation not yet recognized (in years)	3 months 18 days
Award vesting period (in years)	3 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	10 years
Net cash flows associated with stock-based awards	$ 15.9
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of compensation not yet recognized (in years)	1 year 7 months 6 days
Restricted stock grants in period (in shares) \| shares	700,000
Unrecognized compensation cost	$ 12.9
Award vesting period (in years)	3 years
Restricted stock or performance stock awards outstanding (in shares) \| shares	1,100,000	1,000,000.0
Aggregate intrinsic value, vested	$ 13.5	$ 14.7	19.7
Vested in period, fair value	13.6	$ 15.8	$ 20.9
Tax benefit realized on the vesting of restricted stock	$ 0.0
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or performance stock awards outstanding (in shares) \| shares	0
Performance Stock And Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of compensation not yet recognized (in years)	2 years 1 month 6 days
Restricted stock grants in period (in shares) \| shares	400,000
Unrecognized compensation cost	$ 4.1
Award vesting period (in years)		3 years
Restricted stock or performance stock awards outstanding (in shares) \| shares	800,000	500,000
Number of individual one-year performance periods \| performance_period		3
Performance stock awards expected to vest (in shares) \| shares	200,000
Weighted average fair value per share of performance stock awards expected to vest (in dollars per share) \| $ / shares	$ 29.61
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or performance stock awards outstanding (in shares) \| shares	0
Minimum \| Performance Stock And Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual award percent		0.00%
Maximum \| Performance Stock And Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual award percent		200.00%
2014 Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average dividend rate	0.00%		0.00%

Employee Service Share-Based Compensation, Tax Benefit Realized From Vesting of Restricted Stock

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