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Stockholders' Equity - Statement of Changes in Common Shares Outstanding (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchases of treasury stock	(23.0)	(23.8)	(25.7)
Common Stock | Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	927.3	948.4	972.1
Purchases of treasury stock	(23.0)	(23.8)	(25.7)
Share-based payments	1.9	2.3	1.8
Conversion of Class B to Class A common stock	0.4	0.4	0.2
Balance	906.6	927.3	948.4
Common Stock | Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	7.2	7.6	7.8
Conversion of Class B to Class A common stock	(0.4)	(0.4)	(0.2)
Balance	6.8	7.2	7.6

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- Definition

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

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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
-Paragraph 4
-Publisher FASB
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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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- Definition

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.

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
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-Topic 210
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-Name Accounting Standards Codification
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