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Commitments and contingencies (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 20, 2021
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Mar. 31, 2022
Commitments and Contingencies          
Other Commitment       $ 12.0  
Payment related to offset obligation     $ 4.0    
Commitments to be paid   $ 8.0      
Commitments to be paid in year one   4.0      
Commitment to be paid in year two   4.0      
Other nonoperating income (expense)   2.0   $ (12.0) $ 3.0
Pending Litigation | Colorado Action          
Commitments and Contingencies          
Litigation settlement amount   27.0      
Pending Litigation | Colorado Action | Other current assets          
Commitments and Contingencies          
Loss contingency insurance receivable   $ 27.0      
Pending Litigation | DigitalGlobe Merger          
Commitments and Contingencies          
Litigation settlement amount $ 37.0        
Pending Litigation | DigitalGlobe Merger | Other current assets          
Commitments and Contingencies          
Loss contingency insurance receivable $ 37.0