Three months ended September 30,

Nine months ended September 30,

(in millions, except per share data)

2023

2022

2023

2022

Net income

$

175.9

$

161.1

$

601.8

$

526.6

Net income attributable to unvested awarded performance stock

(2.6

)

(2.9

)

(9.4

)

(10.1

)

Net income attributable to common shares

$

173.3

$

158.2

$

592.4

$

516.5

Weighted average number of common shares outstanding – basic

284.1

283.0

283.7

282.7

Less unvested awarded performance stock included in weighted
   average number of common shares outstanding – basic

(4.2

)

(5.2

)

(4.4

)

(5.4

)

Weighted average number of common shares outstanding for basic
   net income per common share

279.9

277.8

279.3

277.3

Dilutive effect of potentially issuable common shares

1.4

0.9

1.1

1.2

Weighted average number of shares outstanding – diluted

281.3

278.7

280.4

278.5

Net income per share:

Basic

$

0.62

$

0.57

$

2.12

$

1.86

Diluted

$

0.62

$

0.57

$

2.11

$

1.85