Summary of Option Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Options | shares	14.0
Exercised, Options | shares	(0.3)
Ending Balance, Options | shares	13.7
Exercisable at March 31, 2020, Options | shares	8.4
Beginning Balance, Weighted-Average Exercise Price | $ / shares	$ 43.23
Exercised, Weighted-Average Exercise Price | $ / shares	29.31
Ending Balance, Weighted-Average Exercise Price | $ / shares	43.62
Exercisable at March 31, 2020 Weighted-Average Exercise Price | $ / shares	$ 34.47
Outstanding at March 31, 2020, Weighted-Average Remaining Contractual Term, years	5 years 2 months 12 days
Exercisable at March 31, 2020, Weighted-Average Remaining Contractual Term, years	3 years 7 months 6 days
Outstanding at March 31, 2020, Aggregate Intrinsic Value | $	$ 300.3
Exercisable at March 31, 2020, Aggregate Intrinsic Value | $	$ 250.5