Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

	Three Months Ended
	March 31,
(in millions, except per share data)	2023		2022
Net income attributable to common shareholders	$	105.7	$	105.0
Average basic shares outstanding	56.5		57.1
Effect of dilutive share-based awards	0.8		0.8
Average diluted shares outstanding	57.3		57.9
Earnings per basic share	$	1.87	$	1.84
Earnings per diluted share	$	1.84	$	1.81