Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 22, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Payments for repurchase of common stock		$ 2,220.2	$ 655.8
December 2019 Share Repurchase Program
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 5,000.0
Repurchase of common stock, at cost, shares		3.2
Payments for repurchase of common stock		$ 941.1
2019 Share Repurchase Program
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount			$ 5,000.0
Repurchase of common stock, at cost, shares		4.1
Payments for repurchase of common stock		$ 1,300.0
Amount remaining under 2019 Share Repurchase Program		$ 2,800.0
Subsequent Event [Member] | 2019 Share Repurchase Program
Class of Stock [Line Items]
Repurchase of common stock, at cost, shares	4.0
Payments for repurchase of common stock	$ 1,300.0