Stockholders' Equity - Schedule of Repurchased Shares (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended					9 Months Ended
	May 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)	9,806,805
Total cost of shares received	$ 5,000.0	$ 100.4	$ 5,071.8	$ 336.0	$ 48.7	$ 54.0
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)		179,824					898,991
Total cost of shares received		$ 100.4					$ 373.3