CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 67.9	$ 71.9
Property, plant and equipment, accumulated depreciation	667.8	678.1
Intangible assets, accumulated amortization	$ 584.9	$ 499.9
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	1,000,000.0	1,000,000.0
Preferred stock, issued (in shares)	0.0	0.0
Preferred stock, outstanding (in shares)	0.0	0.0
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)	91,200,000	90,700,000
Common stock, outstanding (in shares)	91,200,000	90,700,000