Earnings Per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

	Three months ended September 30,				Nine months ended September 30,
	2023		2022		2023		2022
Net income available to common stockholders	$	54.7	$	42.9	$	99.1	$	274.4
Denominator:
Basic weighted average share outstanding	182,148,717		110,838,237		161,724,677		110,750,021
Effect of dilutive securities:
Share units	875,477		641,284		655,762		496,273
Stock options and ESPP	577,407		730,014		536,154		611,801
Diluted average shares outstanding	183,601,601		112,209,535		162,916,593		111,858,095
Net income per share attributable to common shares:
Basic	$	0.30	$	0.39	$	0.61	$	2.48
Diluted	$	0.30	$	0.38	$	0.61	$	2.45