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Stock Transactions - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 03, 2012
Nov. 26, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 14, 2014
Stock Transactions [Line Items]            
Repurchase of common Stock   $ 200,000,000us-gaap_TreasuryStockValueAcquiredCostMethod     $ 200,000,000us-gaap_TreasuryStockValueAcquiredCostMethod  
Stock repurchase date     Nov. 26, 2012      
Stock repurchase during period 3,900,000us-gaap_TreasuryStockSharesAcquired          
Stock repurchase during period price per share $ 51.91us-gaap_TreasuryStockAcquiredAverageCostPerShare          
Payment to acquire business     3,670,000,000us-gaap_BusinessCombinationConsiderationTransferred1 839,300,000us-gaap_BusinessCombinationConsiderationTransferred1 207,400,000us-gaap_BusinessCombinationConsiderationTransferred1  
Comdata Inc. [Member]            
Stock Transactions [Line Items]            
Payment to acquire business           3,420,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= flt_ComdataIncMember
Cash consideration           $ 2,400,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= flt_ComdataIncMember
Common shares issued to finance acquisition           7,625,380us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= flt_ComdataIncMember