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Divestitures (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Goodwill $ 561,500,000 $ 561,500,000   $ 561,500,000   $ 556,800,000  
Gain on sale of business   17,500,000 $ 0 17,500,000 $ 0    
HelloWallet | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain on sale of business 17,500,000.0            
Proceeds from sale 23,700,000            
Disposal group, goodwill $ 2,400,000 $ 2,400,000   $ 2,400,000      
HelloWallet              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Remaining interest             81.30%
Value of company acquired             $ 54,000,000
Goodwill             39,200,000
Intangible assets             $ 9,500,000