CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 58.1	$ 67.9
Property, plant and equipment, accumulated depreciation	628.8	667.8
Intangible assets, accumulated amortization	$ 550.4	$ 584.9
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	120,000,000.0	120,000,000.0
Common stock, issued (in shares)	91,400,000	91,200,000
Common stock, outstanding (in shares)	91,400,000	91,200,000