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Operations and Significant Accounting Policies - Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Lessee, Lease, Description [Line Items]    
Operating Lease Cost $ 5.4 $ 5.0
Finance Lease Cost 0.3 0.1
Operating Cash Flows From Operating Leases 5.4 5.0
Financing Cash Flows From Finance Leases 0.4 0.2
Operating Lease Other Non-Current Assets $ 9.1 $ 10.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Non-Current Assets Other Non-Current Assets
Finance Lease Other Non-Current Assets $ 1.9 $ 2.1
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Non-Current Assets Other Non-Current Assets
Total Lease Right-of-use Assets $ 11.0 $ 12.8
Operating Lease Liabilities $ 3.2 $ 3.0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Other
Finance Lease Liabilities $ 0.4 $ 0.4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Other
Operating Lease Liabilities $ 6.0 $ 7.7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Non-Current Liabilities Other Non-Current Liabilities
Finance Lease Liabilities $ 1.3 $ 1.6
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Non-Current Liabilities Other Non-Current Liabilities
Total Lease Liabilities $ 10.9 $ 12.7
Operating Lease Rent Expense 5.4 5.0
Finance Lease Interest Expense 0.1 0.0
Finance Lease Amortization Expense 0.2 0.1
Total Operating and Finance Lease Expenses $ 5.7 $ 5.1
Vehicles and Equipment    
Weighted Average Remaining Lease Term (Years):    
Operating Leases 2 years 3 years
Finance Leases 4 years 5 years
Weighted Average Discount Rate:    
Operating Lease 4.00% 4.00%
Finance Lease 5.40% 5.40%
Land and Other    
Weighted Average Remaining Lease Term (Years):    
Operating Leases 23 years 12 years
Weighted Average Discount Rate:    
Operating Lease 5.90% 5.00%