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Pension and Savings Plans - Textual (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
numberOfPlan
Jun. 30, 2023
Dec. 31, 2025
USD ($)
numberOfPlan
Jun. 30, 2025
Dec. 31, 2024
USD ($)
Jun. 30, 2024
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan Termination, Final Contribution Amount $ 5.0   $ 5.0        
Letter of credit release 37.0   37.0        
Pension Plan              
Defined Benefit Plan Disclosure [Line Items]              
Defined benefit plan, assets 106.5   106.5   $ 104.8    
Funded status at end of period (8.0)   (8.0)   (12.8)   $ 11.1
Defined Benefit Plan, Benefit Obligation, Payment for Settlement             443.2
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 2.1   2.1        
Defined Benefit Plan, Benefit Obligation 114.5   114.5   117.6    
2026 10.7   10.7        
2027 10.6   10.6        
2028 10.4   10.4        
2029 10.2   10.2        
2030 10.0   10.0        
Years 2031-2035 45.6   45.6        
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 2.1   $ 2.1        
401(k) plans              
Defined Benefit Plan Disclosure [Line Items]              
Number of 401(k) plans | numberOfPlan 3   3        
Defined contribution plan expense     $ 22.4   21.7   21.3
Discretionary contributions to defined contribution plans, granted     7.8   7.8   7.3
Discretionary contributions to defined contribution plans, paid     7.7   7.7   4.6
Superannuation              
Defined Benefit Plan Disclosure [Line Items]              
Defined contribution plan expense     27.0   25.7   21.9
Discretionary contributions to defined contribution plans, granted     1.6   2.2   1.6
Discretionary contributions to defined contribution plans, paid     $ 2.0   $ 1.9   $ 1.3
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 12.00% 10.50%   11.50%   11.00%  
Fixed Income Investments              
Defined Benefit Plan Disclosure [Line Items]              
Plan assets, target allocation, percentage 100.00%   100.00%   100.00%