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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Operating Loss Carryforwards [Line Items]          
Net operating losses $ 9.2   $ 9.2 $ 13.7  
Reserves for uncertain tax positions 115.4   115.4 552.3 $ 79.9
Unrecognized tax benefits that would impact effective tax rate 104.2   104.2 91.1 78.5
Unrecognized tax benefits that decrease deferred tax assets 1.4   1.4 3.0  
Accrued interest and penalties     7.4 2.9 1.7
Income tax reserve, accrued penalties and interest 13.2   13.2 $ 5.8 $ 2.9
Income taxes paid 13.2 $ 10.5      
Federal          
Operating Loss Carryforwards [Line Items]          
Net operating losses 1.2   1.2    
State          
Operating Loss Carryforwards [Line Items]          
Net operating losses 3.1   3.1    
Foreign          
Operating Loss Carryforwards [Line Items]          
Net operating losses $ 4.9   4.9    
Tax Years 2013-2015          
Operating Loss Carryforwards [Line Items]          
Income tax assessments     $ 42.7