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Intangible Assets, net and Goodwill - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 3,013.7 | $ 2,888.4 | $ 3,013.7 |
Foreign currency adjustments |  |  |  |  | 53.1 | (56.3) |
Impairment charges | $ (69.0) | $ 0.0 | $ 0.0 | 0.0 | 0.0 | (69.0) | $ (1,002.6)
Acquired goodwill |  |  |  |  | 14.6 |  |
Balance at the end of the period | 2,888.4 |  |  |  | 2,956.1 | 2,888.4 | 3,013.7
Gaming |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 2,486.0 | 2,428.6 | 2,486.0 |
Foreign currency adjustments |  |  |  |  | 46.9 | (57.4) |
Impairment charges |  |  |  |  |  | 0.0 | (935.0)
Acquired goodwill |  |  |  |  | 0.0 |  |
Balance at the end of the period | 2,428.6 |  |  |  | 2,475.5 | 2,428.6 | 2,486.0
Cumulative goodwill impairment charges |  |  |  |  | 935.0 |  |
Lottery |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 417.9 | 350.0 | 417.9 |
Foreign currency adjustments |  |  |  |  | 6.2 | 1.1 |
Impairment charges | (69.0) |  |  |  |  | (69.0) |
Acquired goodwill |  |  |  |  | 0.0 |  |
Balance at the end of the period | 350.0 |  |  |  | 356.2 | 350.0 | 417.9
Cumulative goodwill impairment charges |  |  |  |  | 136.6 |  |
Interactive |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 109.8 | 109.8 | 109.8 |
Foreign currency adjustments |  |  |  |  | 0.0 | 0.0 |
Impairment charges |  |  |  |  |  | 0.0 |
Acquired goodwill |  |  |  |  | 14.6 |  |
Balance at the end of the period | $ 109.8 |  |  |  | $ 124.4 | $ 109.8 | $ 109.8

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