Debt - Other Credit Facilities (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CAD ($)
Debt Instrument [Line Items]
Long-term debt obligations			$ 0
Letters of credit issued	$ 82,100,000		166,700,000
Other Credit Facilities
Debt Instrument [Line Items]
Long-term debt obligations	0	$ 20.0		$ 20.0
Line of credit facility, maximum borrowing capacity	15,100,000		14,800,000
Line of Credit | Standby Letters of Credit
Debt Instrument [Line Items]
Letters of credit issued	17,200,000		$ 23,600,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 50,000,000
Line of Credit | Letter of Credit | Standby Letters of Credit
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	0.90%	0.90%	0.75%	0.75%