Summary of Option Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Options | shares	12.7
Granted, Options | shares	1.5
Exercised, Options | shares	(0.6)
Cancelled, Options | shares	(0.1)
Ending Balance, Options | shares	13.5
Exercisable at Sept 30, 2021, Options | shares	8.6
Beginning Balance, Weighted-Average Exercise Price | $ / shares	$ 50.72
Granted, Weighted-Average Exercise Price | $ / shares	84.75
Exercised, Weighted-Average Exercise Price | $ / shares	40.03
Cancelled, Weighted-Average Exercise Price | $ / shares	72.65
Ending Balance, Weighted-Average Exercise Price | $ / shares	54.95
Exercisable at Sep 30, 2021 Weighted-Average Exercise Price | $ / shares	$ 41.99
Outstanding at Sep 30, 2021, Weighted-Average Remaining Contractual Term, years	5 years 8 months 12 days
Exercisable at Sep 30, 2021, Weighted-Average Remaining Contractual Term, years	4 years
Outstanding at Sep 30, 2021, Aggregate Intrinsic Value | $	$ 374.9
Exercisable at Sep 30, 2021, Aggregate Intrinsic Value | $	$ 350.0