Commitments and contingencies (Details) $ in Millions	Jun. 17, 2022 USD ($)	May 05, 2022 USD ($)	May 31, 2022 USD ($) case	Jun. 30, 2021 case
Washtenaw County Employees’ Retirement System v. Walgreen Co. et al. | Pending Litigation
Loss Contingencies [Line Items]
Estimated settlement amount, liability | $			$ 105.0
City and Cnty. of San Francisco, et al. v. Purdue Pharma L.P., et al. | Pending Litigation
Loss Contingencies [Line Items]
Number of litigation cases outstanding | case			1
Cnty. of Lake, Ohio v. Purdue Pharma L.P., et al. | Pending Litigation
Loss Contingencies [Line Items]
Number of litigation cases outstanding | case			2
The Cherokee Nation v. McKesson Corp., et al. | Pending Litigation
Loss Contingencies [Line Items]
Number of litigation cases outstanding | case			1
Bellweather Litigation Cases | Pending Litigation
Loss Contingencies [Line Items]
Number of litigation cases outstanding | case			5
Consolidated Cases in N.D. Ohio | Pending Litigation
Loss Contingencies [Line Items]
Number of litigation cases outstanding | case			2
Consolidated Cases in New York State Court
Loss Contingencies [Line Items]
Number of litigation cases outstanding | case				2
Consolidated Cases in State of Florida | Pending Litigation
Loss Contingencies [Line Items]
Estimated settlement amount, liability | $		$ 683.0
Estimated settlement amount | $		683.0
Estimated settlement amount, noncurrent liability | $		$ 620.0	$ 585.6
Settlement period		18 years
Estimated settlement amount, current liability | $		$ 63.0	$ 97.4
Consolidated Cases in State of Florida | Pending Litigation | Subsequent Event
Loss Contingencies [Line Items]
Payments for legal settlements | $	$ 97.4