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Divestitures (Amounts Included in the Gain on Sale of Business (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total gain on sale of business   $ 0.0 $ 10.5 $ 0.0
HelloWallet [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds received       23.7
Intangibles and internally developed software       (4.5)
Goodwill $ (2.4)     (2.4)
Other assets and liabilities       (0.1)
Total gain on sale of business $ 16.7     $ 16.7