Summary of Option Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Options | shares	14.0
Granted, Options | shares	1.8
Exercised, Options | shares	(1.5)
Cancelled, Options | shares	(0.1)
Ending Balance, Options | shares	14.2
Exercisable at June 30, 2020, Options | shares	8.9
Beginning Balance, Weighted-Average Exercise Price | $ / shares	$ 43.23
Granted, Weighted-Average Exercise Price | $ / shares	73.89
Exercised, Weighted-Average Exercise Price | $ / shares	29.35
Cancelled, Weighted-Average Exercise Price | $ / shares	61.87
Ending Balance, Weighted-Average Exercise Price | $ / shares	48.61
Exercisable at June 30, 2020 Weighted-Average Exercise Price | $ / shares	$ 38.78
Outstanding at June 30, 2020, Weighted-Average Remaining Contractual Term, years	5 years 10 months 24 days
Exercisable at June 30, 2020, Weighted-Average Remaining Contractual Term, years	4 years 2 months 12 days
Outstanding at June 30, 2020, Aggregate Intrinsic Value | $	$ 407.0
Exercisable at June 30, 2020, Aggregate Intrinsic Value | $	$ 341.9