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Earnings Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 20, 2021	Dec. 31, 2020	Jul. 31, 2019	Jul. 19, 2019
Stock options, outstanding	658,600	723,914	658,600	723,914		696,711
Stock options, weighted average exercise price	$ 54.93	$ 41.03	$ 54.93	$ 41.03		$ 43.88
Common stock excluded from calculation of diluted earnings per share	44,912	60,202	63,770	117,160
Dilutive effect on shares of conversion premium	1,373,341	0	1,180,425	0
Contingent consideration obligation for earnout payments					$ 80.0
0.375% Convertible Senior Notes due 2024
Principal amount							$ 287.5	$ 287.5
Restricted Stock Units and Performance Stock Units
Restricted stock units, outstanding	619,761	675,567	619,761	675,567		665,540

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