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Asset Impairments and Assets Held for Sale (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
AircraftEngines
Jun. 30, 2023
USD ($)
AircraftEngines
Mar. 31, 2023
USD ($)
AircraftEngines
Sep. 30, 2022
USD ($)
AircraftEngines
Sep. 30, 2023
USD ($)
AircraftEngines
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
AircraftEngines
Asset Impairment [Line Items]                
Asset Impairment Charges $ 0.0     $ 10.8 $ 1.2 $ 42.3    
Total 11.9       11.9   $ 40.0  
Number of Specialized Gas Vessels Sold | AircraftEngines   1 1          
Number of Specialized Gas Vessels | AircraftEngines               5
Number of Specialized Gas Vessels | AircraftEngines               5
Accumulated Foreign Currency Adjustment Attributable to Rail International                
Asset Impairment [Line Items]                
Asset Impairment Charges             1.2  
Portfolio Management                
Asset Impairment [Line Items]                
Asset Impairment Charges     $ 1.2 $ 0.0 1.2 31.5 34.3  
Total $ 11.4       $ 11.4   25.1  
Number of Specialized Gas Vessels Sold | AircraftEngines   1 1 2        
Number of Specialized Gas Vessels With Impairment Recorded | AircraftEngines     1          
Gain (Loss) on Disposition of Assets   $ 0.2 $ 0.4          
Number of Specialized Gas Vessels | AircraftEngines 1   2   1      
Number of Specialized Gas Vessels | AircraftEngines 1   2   1      
Gain (Loss) on Disposition of Assets   $ 0.2 $ 0.4          
Rail North America                
Asset Impairment [Line Items]                
Asset Impairment Charges         $ 0.0      
Total $ 0.5       0.5   1.2  
Rail International                
Asset Impairment [Line Items]                
Asset Impairment Charges       $ 10.8 0.0 $ 10.8 14.6  
Total $ 0.0       $ 0.0   $ 13.7  
Gain (Loss) on Disposition of Business     $ 0.3