CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowances for credit losses	$ 13.1	$ 10.7	$ 13.1
Common stock, par value (USD per share)	$ 1.00	$ 1.00	$ 1.00
Common stock authorized (in shares)	1,000,000,000	1,000,000,000	1,000,000,000
Common stock issued (in shares)	441,400,000	441,400,000	441,400,000
Treasury stock (in shares)	88,900,000	90,700,000	92,600,000