Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 39.7	$ 42.5
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	15,000,000	15,000,000
Preferred stock, dividend rate	5.00%	5.00%
Preferred stock, shares issued (in shares)	0	1,400,000
Preferred stock, shares outstanding (in shares)	0	1,400,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000.0
Common stock, shares issued (in shares)	360,400,000	339,000,000
Common stock, shares outstanding (in shares)	359,100,000	337,900,000