Debt - Other Credit Facilities (Details) $ in Millions, $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CAD ($)
Debt Instrument [Line Items]
Letters of credit issued	$ 81.7		$ 82.1
Other Credit Facilities
Debt Instrument [Line Items]
Long-term debt obligations	0.0	$ 20.0	0.0	$ 20.0
Line of credit facility, maximum borrowing capacity	13.9		15.1
Line of Credit | Standby Letters of Credit
Debt Instrument [Line Items]
Letters of credit issued	17.4		$ 17.2
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 50.0
Line of Credit | Letter of Credit | Standby Letters of Credit
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	0.75%	0.75%	0.90%	0.90%