Three Months Ended September 30,

Nine Months Ended September 30,

(In millions except per share data)

2021

2020

2021

2020

Net income (loss)

$

252.5

$

177.4

$

418.1

$

(228.5)

Average common shares outstanding:

Basic average common shares outstanding

200.2

200.1

Effect of dilutive securities:

Contingently issuable shares (performance and restricted stock units)

0.2

0.3

0.2

—

Diluted average common shares outstanding

200.4

200.3

200.1

Basic earnings (loss) per average common share

$

1.26

$

0.89

$

2.09

$

(1.14)

Diluted earnings (loss) per average common share

$

1.26

$

0.89

$

2.09

$

(1.14)

Anti-dilutive shares excluded from earnings per share calculation

—

0.3