Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Allowance for doubtful accounts receivable	$ 21.6	$ 17.9
Accumulated amortization of finite-lived intangible assets	$ 3,146.7	$ 2,890.5
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000.0	5,000,000.0
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000.0	400,000,000.0
Common stock, shares issued	270,300,000	269,100,000
Common stock, shares outstanding	255,000,000.0	256,000,000.0
Treasury stock, shares	15,400,000	13,100,000
Class A Non-Voting Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	5,000,000.0	5,000,000.0
Common stock, shares issued	0	0