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Other Receivables and Allowances and Other Reserves - Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 2.7 $ 2.5 $ 3.9
Provision (release) - charged against income 0.0 0.2 (1.4)
Write-offs (charged against allowance) or other 0.8 0.0 0.0
Balance at end of year 3.5 2.7 2.5
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year 2.5 0.8 2.6
Provision (release) - charged against income 0.8 0.2 (1.7)
Write-offs (charged against allowance) or other (0.3) 1.4 (0.1)
Balance at end of year 2.9 2.5 0.8
Previously Reported      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year 2.4    
Balance at end of year   2.4  
Land Operations      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year 2.7 2.5 3.9
Provision (release) - charged against income 0.2 0.2 (1.4)
Write-offs (charged against allowance) or other 0.0 0.0 0.0
Balance at end of year 2.9 2.7 2.5
Commercial property      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year 0.0 0.0 0.0
Provision (release) - charged against income (0.2) 0.0 0.0
Write-offs (charged against allowance) or other 0.8 0.0 0.0
Balance at end of year $ 0.6 $ 0.0 $ 0.0