CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Pension and other postretirement adjustments, tax	$ 0.5	$ 0.2	$ 2.8	$ 0.3
Amortization of forward starting swaps, tax			$ 0.5	$ 0.2
Issuance of common stock from performance share units and exercise of stock options (in shares)	42,408	73,755	67,476	106,122
Issuance of common stock from exercise of stock options and deferred compensation plans, tax amount	$ 0.4	$ 1.7	$ 0.6	$ 1.9
Purchase of common stock (in shares)	474,690	147,500
Cash dividends declared, per common share outstanding (in dollars per share)	$ 1.20		$ 1.08