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Stockholders' Equity - Common Stock Dividends and Reconciliation of Outstanding Common Shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended					3 Months Ended		6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jan. 31, 2022	Jun. 30, 2021	Feb. 29, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Common stock share repurchase disclosures
Amount of forward contract recorded in additional paid in capital						$ (97.2)		$ 42.8
Common stock
Common Stock Dividends
Dividends declared per common share (in dollars per share)						$ 0.64	$ 0.61	$ 1.28	$ 1.17
Reconciliation of Outstanding Common Shares
Outstanding shares at beginning of period			261.7			252.2	272.5	261.7	273.3
Shares issued						0.6	0.7	2.3	2.1
Treasury stock acquired						(2.9)	(4.2)	(14.1)	(6.4)
Outstanding shares at end of period	249.9	252.2		269.0		249.9	269.0	249.9	269.0
Common stock share repurchase disclosures
Share repurchase program, maximum authorized amount (in dollars)			$ 1,600.0	$ 1,200.0	$ 900.0
Common stock | March 2022 Accelerated Share Repurchase Program
Common stock share repurchase disclosures
Share repurchase program, maximum authorized amount (in dollars)		$ 700.0
Number of shares repurchased	1.4	8.5
Initial cost of shares repurchased		$ 560.0
Amount of forward contract recorded in additional paid in capital		$ 140.0
Volume-weighted average price of our common stock	$ 70.53

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