Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Trade accounts receivable, allowance for credit losses	$ 10.9	$ 12.0
Preferred stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Authorized (in shares)	5,000,000	5,000,000
Issued (in shares)	0	0
Outstanding (in shares)	0	0
Common stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Authorized (in shares)	800,000,000	800,000,000
Issued (in shares)	575,601,845	575,464,682
Outstanding (in shares)	575,601,845	575,464,682

Amount of allowance for credit loss on accounts receivable, classified as current.

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