Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

	Three Months Ended
	March 31,
(in millions, except per share data)	2020		2019
Net income attributable to common shareholders	$	62.8	$	82.4
Average basic shares outstanding	58.8		59.8
Effect of dilutive share-based awards	0.8		0.9
Average diluted shares outstanding	59.6		60.7
Earnings per basic share	$	1.07	$	1.38
Earnings per diluted share	$	1.05	$	1.36