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Basis of Presentation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Basis of Presentation [Line Items]              
Gain (loss) on remeasurement of U.S. dollar denominated intercompany loan $ 16.2 $ (31.2) $ (78.5) $ 24.1      
Repayment of debt     132.1        
Intercompany foreign currency outstanding balance $ 1,200.0   $ 1,200.0       $ 1,300.0
Useful life           15 years  
Increase in diluted shares $ 2.40 $ 0.80 $ 5.33 $ 3.60      
ASC 250 [Member]              
Basis of Presentation [Line Items]              
Useful life           30 years  
Reduction in depreciation and amortization expense after tax $ 93.3   $ 279.2        
Reduction in depreciation and amortization expense $ 103.0   $ 308.5        
Increase in diluted shares $ 0.86   $ 2.58        
ASC 250 [Member] | Scenario, Forecast [Member]              
Basis of Presentation [Line Items]              
Reduction in depreciation and amortization expense after tax         $ 372.5    
Reduction in depreciation and amortization expense         $ 411.5    
Increase in diluted shares         $ 3.45    
Related Party [Member]              
Basis of Presentation [Line Items]              
Intercompany loans funded $ 9.3   $ 9.3