CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 15.6	$ 13.9
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000.0	10,000,000.0
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, authorized (in shares)	300,000,000.0	300,000,000.0
Common stock, issued (in shares)	189,300,000	189,300,000
Common stock, outstanding (in shares)	122,400,000	122,100,000
Treasury stock (in shares)	66,300,000	66,600,000
Stock held by employee benefits trusts (in shares)	600,000	600,000