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Goodwill and Identifiable Intangible Assets - Goodwill (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill    
Impairment charge $ 0 $ (72,300,000)
Impairment of intangible assets 0  
Goodwill    
Balance at the beginning of the period 845,500,000 835,900,000
Acquisitions 13,400,000 63,500,000
Adjustment of purchase price allocations 2,300,000 6,000,000.0
Impairment charge 0 (72,300,000)
Foreign currency translation of non-USD functional currency subsidiary goodwill (8,400,000) 12,500,000
Balance at the end of the period 852,700,000 845,500,000
Aviation segment    
Goodwill    
Impairment charge   0
Goodwill    
Balance at the beginning of the period 326,900,000 266,900,000
Acquisitions 0 51,200,000
Adjustment of purchase price allocations (2,200,000) 6,200,000
Impairment charge   0
Foreign currency translation of non-USD functional currency subsidiary goodwill (1,800,000) 2,700,000
Balance at the end of the period 322,900,000 326,900,000
Land segment    
Goodwill    
Impairment charge   0
Impairment of intangible assets   12,800,000
Goodwill    
Balance at the beginning of the period 518,500,000 496,700,000
Acquisitions 13,400,000 12,200,000
Adjustment of purchase price allocations 4,500,000 (100,000)
Impairment charge   0
Foreign currency translation of non-USD functional currency subsidiary goodwill (6,700,000) 9,800,000
Balance at the end of the period 529,700,000 518,500,000
Marine segment    
Goodwill    
Goodwill impairment and intangible asset impairment   79,100,000
Impairment charge   (72,300,000)
Goodwill    
Balance at the beginning of the period 0 72,300,000
Acquisitions 0 0
Adjustment of purchase price allocations 0 0
Impairment charge   (72,300,000)
Foreign currency translation of non-USD functional currency subsidiary goodwill 0
Balance at the end of the period $ 0 $ 0