Common stock - (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Feb. 28, 2022	Dec. 31, 2020
Subsequent Public Offering
Class of Stock [Line Items]
Sale of stock, shares issued (in shares)	5,227,272	3,136,362
Sale of stock, share price (in usd per share)	$ 55.00	$ 110.00
Sale of stock, consideration received		$ 323.9
Over-Allotment Option
Class of Stock [Line Items]
Sale of stock, shares issued (in shares)	681,818	409,090
Sale of stock, consideration received	$ 269.8