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Stockholders' Equity - Common Stock Dividends and Reconciliation of Outstanding Common Shares (Details) - Common stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended
	Feb. 29, 2020	Nov. 30, 2018	Mar. 31, 2021	Mar. 31, 2020
Common Stock Dividends
Dividends declared per common share (in dollars per share)			$ 0.56	$ 0.56
Reconciliation of Outstanding Common Shares
Outstanding shares at beginning of period			273.3	276.6
Shares issued			1.4	1.2
Treasury stock acquired			(2.2)	(4.4)
Outstanding shares at end of period			272.5	273.4
Common stock share repurchase disclosures
Share repurchase program, maximum authorized amount (in dollars)	$ 900.0	$ 500.0

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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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This element represents the maximum amount authorized for share repurchase by the board of directors.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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

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Number of new stock issued during the period.

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

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