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Goodwill and Identifiable Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill    
Goodwill impairment and intangible asset impairment $ 80.2  
Goodwill impairment charge 72.3  
Impairment of intangible assets 7.9  
Goodwill    
Balance at the beginning of the period 835.8 $ 675.8
Acquisitions 63.5 173.3
Adjustment of purchase price allocations 6.0 6.9
Impairment charge (72.3)  
Foreign currency translation of non-USD functional currency subsidiary goodwill 12.5 (20.3)
Balance at the end of the period 845.5 835.8
Aviation segment    
Goodwill    
Goodwill impairment charge 0.0  
Goodwill    
Balance at the beginning of the period 266.8 173.7
Acquisitions 51.2 95.6
Adjustment of purchase price allocations 6.2 1.3
Impairment charge 0.0  
Foreign currency translation of non-USD functional currency subsidiary goodwill 2.7 (3.7)
Balance at the end of the period 326.9 266.8
Land segment    
Goodwill    
Goodwill impairment charge 0.0  
Goodwill    
Balance at the beginning of the period 496.7 430.7
Acquisitions 12.2 77.7
Adjustment of purchase price allocations (0.1) 5.5
Impairment charge 0.0  
Foreign currency translation of non-USD functional currency subsidiary goodwill 9.8 (17.3)
Balance at the end of the period 518.5 496.7
Marine segment    
Goodwill    
Goodwill impairment charge 72.3  
Goodwill    
Balance at the beginning of the period 72.3 71.4
Acquisitions 0.0 0.0
Adjustment of purchase price allocations 0.0 0.1
Impairment charge (72.3)  
Foreign currency translation of non-USD functional currency subsidiary goodwill 0.0 0.7
Balance at the end of the period $ 0.0 $ 72.3