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Note 13 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 05, 2024
Jul. 01, 2021
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     $ 8.4     $ 8.4  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     25,195,045     25,195,045  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)     22,646,655     22,646,655  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value     $ 188.6     $ 188.6  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value     $ 177.8     $ 177.8  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)           1,502,820  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value           $ 9.5  
Share-Based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           10 years  
Restricted Stock Units (RSUs) [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           3,727,387  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)     10,031,797     10,031,797  
Performance Shares [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           502,676  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)     502,676     502,676  
Time and Performance Based Units [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 7.52  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value           $ 35.5  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share)           $ 6.29  
Earn-Out RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Fair Value   $ 2.5          
The 2021 Plan [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     27,210,325     27,210,325  
Share-Based Payment Arrangement, Expense     $ 9.8 $ 9.3   $ 29.8 $ 27.0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 469,920            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value           2.0  
The 2021 Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years    
The 2021 Plan [Member] | Time and Performance Based Units [Member]              
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount     $ 60.0     $ 60.0  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 6 months