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Intangible Assets, net and Goodwill - Goodwill (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) unit | Dec. 31, 2018 USD ($) unit | Dec. 31, 2017 USD ($)
Goodwill [Line Items] |  |  |
Number of reporting units | unit | 9 | 9 |
Goodwill |  |  |
Balance at the beginning of the period | $ 2,956.1 | $ 2,956.1 | $ 2,888.4
Reporting unit reallocation adjustment |  | 0.0 |
Acquired goodwill |  | 379.1 | 14.6
Foreign currency adjustments |  | (55.3) | 53.1
Balance at the end of the period |  | 3,279.9 | 2,956.1
Gaming |  |  |
Goodwill |  |  |
Balance at the beginning of the period | 2,475.5 | 2,475.5 | 2,428.6
Reporting unit reallocation adjustment |  | 0.0 |
Acquired goodwill |  | 0.0 | 0.0
Foreign currency adjustments |  | (27.0) | 46.9
Balance at the end of the period |  | 2,448.5 | 2,475.5
Accumulated goodwill impairment charges |  | 935.0 |
Lottery |  |  |
Goodwill |  |  |
Balance at the beginning of the period | 356.2 | 356.2 | 350.0
Reporting unit reallocation adjustment |  | 0.0 |
Acquired goodwill |  | 0.0 | 0.0
Foreign currency adjustments |  | (3.8) | 6.2
Balance at the end of the period |  | 352.4 | 356.2
Accumulated goodwill impairment charges |  | 136.6 |
Interactive |  |  |
Goodwill |  |  |
Balance at the beginning of the period | 124.4 | 124.4 | 109.8
Reporting unit reallocation adjustment |  | (124.4) |
Acquired goodwill |  | 0.0 | 14.6
Foreign currency adjustments |  | 0.0 | 0.0
Balance at the end of the period |  | 0.0 | 124.4
Social |  |  |
Goodwill |  |  |
Balance at the beginning of the period | 0.0 | 0.0 | 0.0
Reporting unit reallocation adjustment | 116.9 | 116.9 |
Acquired goodwill |  | 0.0 | 0.0
Foreign currency adjustments |  | (1.8) | 0.0
Balance at the end of the period |  | 115.1 | 0.0
Digital |  |  |
Goodwill |  |  |
Balance at the beginning of the period | 0.0 | 0.0 | 0.0
Reporting unit reallocation adjustment | $ 7.5 | 7.5 |
Acquired goodwill |  | 379.1 | 0.0
Foreign currency adjustments |  | (22.7) | 0.0
Balance at the end of the period |  | $ 363.9 | $ 0.0

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