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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Assets acquired:    
Goodwill [1] $ 680.6 $ 675.8
Acquisitions 2016 | Land Segment    
Assets acquired:    
Goodwill 2.1  
2015 Acquisitions | Land Segment    
Goodwill    
Increase (decrease) in goodwill 0.1  
2014 Acquisitions | Land Segment    
Goodwill    
Increase (decrease) in goodwill due to foreign currency translation adjustments (1.8)  
2014 Acquisitions | Aviation Segment    
Goodwill    
Increase (decrease) in goodwill due to foreign currency translation adjustments 1.0  
2014 Acquisitions | Marine segment    
Goodwill    
Increase (decrease) in goodwill due to foreign currency translation adjustments $ 0.3  
[1] Amounts may not add due to rounding