Leases - Additional Operating Leases Not Yet Commenced (Details) - Subsequent event - USD ($) $ in Millions	Oct. 21, 2021	Nov. 30, 2020	Jan. 31, 2020
Lessee, Lease, Description [Line Items]
Commencing	$ 131
Compounding pharmacy and offices
Lessee, Lease, Description [Line Items]
Lease Term			14 years
Commencing			$ 25
Compounding pharmacy
Lessee, Lease, Description [Line Items]
Lease Term		20 years
Commencing		$ 28
New corporate headquarters
Lessee, Lease, Description [Line Items]
Lease Term	20 years
Commencing	$ 78