Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions, except per share data)	2023		2022		2023		2022
Net income attributable to common shareholders	$	51.9	$	44.6	$	138.8	$	142.9
Average basic shares outstanding	56.8		56.7		56.8		56.7
Effect of dilutive share-based awards	0.7		—		0.6		—
Average diluted shares outstanding	57.5		56.7		57.4		56.7
Earnings per basic share	$	0.91	$	0.79	$	2.44	$	2.52
Earnings per diluted share	$	0.90	$	0.79	$	2.42	$	2.52