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Goodwill and Identifiable Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Balance at the beginning of the period $ 843.7 $ 852.7
Adjustment for sale of business (71.6) (13.3)
Foreign currency translation of non-USD functional currency subsidiary goodwill 7.4 4.3
2020 acquisitions 79.1  
Balance at the end of the period 858.6 843.7
Aviation segment    
Goodwill [Roll Forward]    
Balance at the beginning of the period 323.6 322.9
Adjustment for sale of business (7.0) 0.0
Foreign currency translation of non-USD functional currency subsidiary goodwill 3.2 0.7
2020 acquisitions 79.1  
Balance at the end of the period 398.8 323.6
Land segment    
Goodwill [Roll Forward]    
Balance at the beginning of the period 520.1 529.7
Adjustment for sale of business (64.6) (13.3)
Foreign currency translation of non-USD functional currency subsidiary goodwill 4.3 3.6
2020 acquisitions 0.0  
Balance at the end of the period $ 459.7 $ 520.1