Earnings Per Share - Schedule of Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income	$ 762.1	$ 653.1
Basic weighted-average common shares outstanding (in shares)	255.1	259.4
Effect of potentially dilutive securities:
Employee stock purchase program (in shares)	0.1	0.0
Diluted weighted-average common shares outstanding (in shares)	257.9	261.9
Basic net income per common share (in dollars per share)	$ 2.99	$ 2.52
Diluted net income per common share (in dollars per share)	$ 2.96	$ 2.49
Stock options
Effect of potentially dilutive securities:
Share-based payment arrangements (in shares)	1.3	1.2
Restricted stock units (including PSUs)
Effect of potentially dilutive securities:
Share-based payment arrangements (in shares)	1.4	1.3