Summary of Option Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Options | shares	12.7
Exercised, Options | shares	(0.1)
Ending Balance, Options | shares	12.6
Exercisable at March 31, 2021, Options | shares	7.4
Beginning Balance, Weighted-Average Exercise Price | $ / shares	$ 50.72
Exercised, Weighted-Average Exercise Price | $ / shares	32.04
Ending Balance, Weighted-Average Exercise Price | $ / shares	51.02
Exercisable at March 31, 2021 Weighted-Average Exercise Price | $ / shares	$ 40.13
Outstanding at March 31, 2021, Weighted-Average Remaining Contractual Term, years	5 years 7 months 6 days
Exercisable at March 31, 2021, Weighted-Average Remaining Contractual Term, years	3 years 8 months 12 days
Outstanding at March 31, 2021, Aggregate Intrinsic Value | $	$ 454.1
Exercisable at March 31, 2021, Aggregate Intrinsic Value | $	$ 348.7