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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
reporting_unit
Dec. 31, 2023
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Restricted cash $ 6.0 $ 6.0
Interest trade receivable percentage 100.00%  
Disposal group, including discontinued operation, accounts, notes and loans receivable, net $ 45.0 60.0
Number of reporting units | reporting_unit 7  
Cash and cash equivalents $ 350.2 365.5
Capital Requirements    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Restricted cash 70.4  
Other Current Assets    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale 2.5  
Other Sundry Assets    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale $ 4.7 $ 7.3