Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Receivables allowance	$ 6.2	$ 5.3
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized shares (in shares)	5,000,000	5,000,000
Preferred stock, unissued shares (in shares)	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized shares (in shares)	200,000,000	200,000,000
Common stock, shares outstanding (in shares)	51,600,000	52,000,000
Treasury, shares (in shares)	26,800,000	26,400,000