CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Pension and other postretirement adjustments, tax	$ 0.0	$ 0.0	$ (0.2)	$ 0.7
Net issuance shares of common stock (in shares)	29,360	28,034	120,767	117,656
Net issuance of shares of common stock, tax amount	$ 0.4	$ 0.4	$ 2.5	$ 2.5
Repurchase of common stock (in shares)		166,433	5,400	788,623
Cash dividends declared, per common share outstanding (in dollars per share)	$ 0.64	$ 0.60	$ 1.92	$ 1.80