Debt - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Aug. 31, 2020	May 31, 2020
Senior Unsecured Notes
Line of Credit Facility [Line Items]
Interest expense	$ 11,100,000	$ 33,300,000
Bridge Facility | Bridge Facility
Line of Credit Facility [Line Items]
Debt, principal amount				$ 1,500,000,000
1.750% Senior Notes due September 2030 | Senior Unsecured Notes
Line of Credit Facility [Line Items]
Debt, principal amount			$ 1,250,000,000
2.800% Senior Notes due September 2050 | Senior Unsecured Notes
Line of Credit Facility [Line Items]
Debt, principal amount			$ 750,000,000