Capital Stock (Tables)

12 Months Ended

Dec. 31, 2022

Stockholders' Equity Note [Abstract]

Schedule of Common Stock Outstanding

Common stock outstanding as of December 31, 2022, 2021 and 2020 was as follows:

(Number of shares in millions)	2022		2021		2020
Common stock:
Balance, beginning of year	110.1		109.7		109.3
Activity under stock plans		0.3		0.4		0.4
Balance, end of year	110.4		110.1		109.7
Treasury stock:
Balance, beginning of year	26.1		26.1		25.7
Repurchased		0.1		—		0.4
Balance, end of year	26.2		26.1		26.1
Common stock outstanding		84.2		84.0	83.6