Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in millions, except per share data)	2020		2019		2020		2019
Net income attributable to common shareholders	$	14.8	$	91.0	$	77.6	$	173.4
Average basic shares outstanding	58.0		59.9		58.5		59.8
Effect of dilutive share-based awards	0.5		0.9		0.6		1.0
Average diluted shares outstanding	58.5		60.8		59.1		60.8
Earnings per basic share	$	0.26	$	1.52	$	1.33	$	2.90
Earnings per diluted share	$	0.25	$	1.50	$	1.31	$	2.85