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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to share-based compensation plans		$ 17.1	$ 16.3	$ 13.5
Compensation expense related to share-based compensation plans, net of tax		$ 13.1	$ 12.1	$ 10.1
Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants		339,196	387,841	500,943
Restricted stock grants, Weighted average grant date fair value		$ 52.07	$ 38.02	$ 47.34
Unrecognized compensation cost related to non-vested share-based compensation		$ 27.5	$ 27.4	$ 31.5
Unrecognized compensation cost weighted average period recognized (years)		2 years 5 months 19 days	2 years 10 months 28 days	2 years 9 months 21 days
Time Based Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		1 year	1 year	1 year
Time Based Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		5 years	5 years	5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to share-based compensation plans		$ 4.5	$ 3.4	$ 1.8
Compensation expense related to share-based compensation plans, net of tax		$ 3.5	2.6	1.3
Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock performance shares earned		200.00%
Additional restricted shares issued		57,000
Restricted stock vesting date		Dec. 04, 2020
Restricted stock grants		132,288
Restricted stock grants, Weighted average grant date fair value		$ 51.07
Unrecognized compensation cost related to non-vested share-based compensation		$ 3.5	$ 4.2	$ 2.4
Unrecognized compensation cost weighted average period recognized (years)		1 year 6 months	1 year 6 months	2 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants, Weighted average grant date fair value	$ 57.00
Total fair value of restricted shares vested		$ 17.8	$ 14.7	$ 13.3
2017 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant		828,022
Non-employee Directors [Member] \| Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		1 year
Employees [Member] \| Time Based Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years
Employees [Member] \| Time Based Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		5 years
Employees [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	3 years
Restricted stock grants	79,608
Employees [Member] \| Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years
Restricted stock grants		75,288	76,500	89,143
Restricted stock grants, Weighted average grant date fair value		$ 51.07	$ 37.20	$ 49.20
Employees [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	5 years
Restricted stock grants	265,308
Employees [Member] \| Time Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants	185,700
Outside Directors [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	1 year
Restricted stock grants	24,563