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Stockholders' Equity - Common Stock Shares Activity (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchases of treasury stock			(19.2)	(18.3)
Common Stock | Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	935.9	960.0	948.4	972.1
Purchases of treasury stock	(4.8)	(4.7)	(19.2)	(18.3)
Share-based payments	0.5	0.1	2.2	1.5
Conversion of Class B to Class A common stock	0.0	0.0	0.2	0.1
Balance at end of period	931.6	955.4	931.6	955.4
Common Stock | Class B
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	7.4	7.7	7.6	7.8
Purchases of treasury stock	0.0	0.0	0.0	0.0
Share-based payments	0.0	0.0	0.0	0.0
Conversion of Class B to Class A common stock	0.0	0.0	(0.2)	(0.1)
Balance at end of period	7.4	7.7	7.4	7.7

X

- Definition

Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, shares

+ References

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- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of shares issued which are neither cancelled nor held in the treasury.

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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-Name Accounting Standards Codification
-Section 50
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