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Revenue recognition - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, amount   $ 408.6  
Contract with customer, asset, noncurrent $ 34.8 38.4  
Current portion of contract liabilities 26.4 22.9  
Other assets 191.3 194.1 $ 40.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01      
Disaggregation of Revenue [Line Items]      
Revenue, remaining performance obligation, amount   $ 400.3  
Revenue, remaining performance obligation, expected timing of satisfaction, period   24 months  
Jansen Pharmaceuticals, Inc.      
Disaggregation of Revenue [Line Items]      
Increase in other assets $ 152.7    
Other assets   $ 153.8  
Non-cancelable orders   $ 5.0  
Leases      
Disaggregation of Revenue [Line Items]      
Lessee, operating lease, remaining lease term   5 years 3 months 18 days  
Lessor, operating lease, payment to be received, remainder of fiscal year   $ 0.2  
Lessor, operating lease, payment to be received, year one   0.9  
Lessor, operating lease, payment to be received, year two   0.9  
Lessor, operating lease, payment to be received, year three   0.9  
Lessor, operating lease, payment to be received, year four   0.9  
Lessor, operating lease, payment to be received, after year four   $ 0.9