Earnings Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share Basic And Diluted [Line Items]
Net income available to common stockholders	$ 54.7	$ 42.9	$ 99.1	$ 274.4
Weighted average number of shares outstanding:
Basic weighted average share outstanding (in shares)	182,148,717	110,838,237	161,724,677	110,750,021
Diluted average shares outstanding (in shares)	183,601,601	112,209,535	162,916,593	111,858,095
Net income per share attributable to common shares:
Basic (usd per share)	$ 0.30	$ 0.39	$ 0.61	$ 2.48
Diluted (usd per share)	$ 0.30	$ 0.38	$ 0.61	$ 2.45
Share units
Weighted average number of shares outstanding:
Effect of dilutive securities: Share units and Stock options (in shares)	875,477	641,284	655,762	496,273
Employee Stock Option and ESPP
Weighted average number of shares outstanding:
Effect of dilutive securities: Share units and Stock options (in shares)	577,407	730,014	536,154	611,801