CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 23.5	$ 25.9
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, authorized	2,000,000	2,000,000
Preferred stock, Issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, Authorized	165,000,000	165,000,000
Common stock, Issued	89,000,000	89,000,000
Treasury stock, shares	18,200,000	18,600,000