Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Allowance for doubtful accounts receivable	$ 25.1	$ 21.7
Accumulated amortization of finite-lived intangible assets	$ 4,063.4	$ 3,445.4
Treasury stock	29,300,000	20,900,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	275,900,000	271,900,000
Common stock, shares outstanding	246,600,000	251,000,000
Class A Non-Voting Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	0	0