Note 14. Commitments and Contingencies (Details) - Commercial Commitments - USD ($) $ in Millions	Feb. 28, 2026	Dec. 31, 2025
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 0.0
Letters of Credit, Remaining Borrowing Capacity		250.0
Line of Credit Facility, Letter of Credit Sub-Limit	$ 450.0	250.0
Bilateral Facilities [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		238.7
Letters of Credit, Remaining Borrowing Capacity		177.1
Letters of Credit Outstanding, Secured by Cash		1.6
Surety Bond
Debt Instrument [Line Items]
Surety Bonds Outstanding, Amount		147.8
Surety Bond Capacity, Remaining Borrowing Capacity		$ 137.3