Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Reconciliation between Basic and Diluted Weighted Average Shares Outstanding

The following is a reconciliation between basic and diluted weighted average shares outstanding:

	Three months ended March 31,
(in millions, except per share data)	2022			2021
Net income	$	220.3		$	199.7
Net income attributable to unvested awarded performance stock		(4.4	)		(5.0	)
Net income attributable to common shares	$	215.9		$	194.7
Weighted average number of common shares outstanding – basic		282.8			282.6
Less unvested awarded performance stock included in weighted    average number of common shares outstanding – basic		(5.7	)		(7.0	)
Weighted average number of common shares outstanding for basic    net income per common share		277.1			275.6
Dilutive effect of potentially issuable common shares		1.5			1.4
Weighted average number of shares outstanding – diluted		278.6			277.0
Net income per share:
Basic	$	0.78		$	0.71
Diluted	$	0.77		$	0.70