10. Commitments and Contingencies (Details) - Commercial Commitments $ in Millions	Mar. 31, 2022 USD ($)
Debt Instrument [Line Items]
Surety Bonds	$ 12.9
Surety Bond Capacity	229.9
Bilateral Facilities [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	43.4
Letters of Credit, Remaining Borrowing Capacity	171.6
Letters of Credit Outstanding, Secured by Cash	$ 2.6