|**Discontinued Operations (Tables)**                                | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|**Discontinued Operations and Disposal Groups [Abstract]**          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Summary information of disposal classified as held for sale         | The following table presents the financial results of Big Fish Games included in "loss from discontinued operations, net of tax" in the accompanying condensed consolidated statements of comprehensive income:Three Months Ended March 31,(in millions)20202019Net revenue$—$—Selling, general and administrative expense1.20.4Loss from discontinued operations before provision for income taxes(1.2)(0.4)Income tax benefit0.30.1Loss from discontinued operations, net of tax$(0.9)$(0.3)
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|                                                                    | Three Months Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|(in millions)                                                       | 2020                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Net revenue                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|Selling, general and administrative expense                         | 1.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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|Loss from discontinued operations before provision for income taxes | (1.2)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Income tax benefit                                                  | 0.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Loss from discontinued operations, net of tax                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

X- ReferencesNo definition available.
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duration X- DefinitionTabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.
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