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Operations and Significant Accounting Policies - Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Lessee, Lease, Description [Line Items]    
Operating Lease Cost $ 5.0 $ 6.3
Finance Lease Cost 0.1 0.0
Operating Cash Flows From Operating Leases 5.0 6.3
Financing Cash Flows From Finance Leases $ 0.2 $ 0.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Non-Current Assets Other Non-Current Assets
Operating Lease Other Non-Current Assets $ 10.7 $ 12.7
Finance 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 $ 2.1 $ 0.0
Total Lease Right-of-use Assets $ 12.8 $ 12.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Other
Operating Lease Liabilities $ 3.0 $ 3.2
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Other
Finance Lease Liabilities $ 0.4 $ 0.0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Non-Current Liabilities Other Non-Current Liabilities
Operating Lease Liabilities $ 7.7 $ 9.3
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Non-Current Liabilities Other Non-Current Liabilities
Finance Lease Liabilities $ 1.6 $ 0.0
Total Lease Liabilities 12.7 12.5
Finance Lease Amortization Expense 0.1 0.0
Total Operating and Finance Lease Expenses $ 5.1 $ 6.3
Vehicles and Equipment    
Weighted Average Remaining Lease Term (Years):    
Operating Leases 3 years 4 years
Finance Leases 5 years 0 years
Weighted Average Discount Rate:    
Operating Lease 4.00% 3.90%
Finance Lease 5.40% 0.00%
Land and Other    
Weighted Average Remaining Lease Term (Years):    
Operating Leases 12 years 16 years
Weighted Average Discount Rate:    
Operating Lease 5.00% 3.90%