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Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4.2	$ 6.1	$ 7.8	$ 11.2
Stock based compensation tax benefit	0.9	$ 1.3	1.2	$ 1.5
Excess tax benefit			0.5
Unrecognized compensation cost	$ 0.3		0.3
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock options exercised			$ 14.1
Period for recognition of compensation not yet recognized			8 months 12 days
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or performance stock awards outstanding (in shares)	0		0
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			1 year 8 months 12 days
Restricted stock or performance stock awards outstanding (in shares)	1,100,000		1,100,000		1,000,000.0
Tax benefit realized on the vesting of restricted stock			$ 0.1
Compensation not yet recognized, share-based awards other than options	$ 19.1		$ 19.1
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or performance stock awards outstanding (in shares)	0		0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of compensation not yet recognized			2 years 4 months 24 days
Restricted stock or performance stock awards outstanding (in shares)	700,000		700,000		500,000
Compensation not yet recognized, share-based awards other than options	$ 12.4		$ 12.4
Performance stock awards expected to vest (in shares)	500,000		500,000
Weighted average fair value per share of performance stock awards expected to vest (in usd per share)	$ 29.89		$ 29.89

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