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10. Commitments and Contingencies (Details) - Commercial Commitments
$ in Millions
Sep. 30, 2024
USD ($)
Revolving Credit Facility  
Debt Instrument [Line Items]  
Letters of Credit, Issued and Outstanding $ 0.0
Letters of Credit, Available Capacity 250.0
Line of Credit Facility, Letter of Credit Sub-Limit 250.0
Bilateral facilities [Member]  
Debt Instrument [Line Items]  
Letters of Credit, Issued and Outstanding 185.4
Letters of Credit, Available Capacity 119.4
Letters of Credit Outstanding, Secured by Cash 9.3
Surety bonds  
Debt Instrument [Line Items]  
Surety Bonds, Issued and Outstanding 28.6
Surety Bonds, Available Capacity $ 225.0