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Software - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Capitalized computer software, amortization |  |  |  |  |  | $ 174.4 | $ 95.7 | $ 39.6
Asset impairment charge | $ 26.4 | $ 103.6 | $ 35.1 | $ 4.6 |  |  |  |
Gaming |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Restructuring, accelerated depreciation expense | $ 11.9 |  |  |  |  |  | 3.8 | 8.0
Asset impairment charge |  |  |  |  |  |  |  | 3.4
Bally Technologies Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Capitalized computer software, additions |  |  |  |  | $ 308.3 |  |  |
Restructuring, accelerated depreciation expense |  |  |  |  |  | 15.8 | 14.5 |
Integrating Scientific Games and WMS | WMS Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Restructuring, accelerated depreciation expense |  |  |  |  |  |  |  | $ 4.6
Internal use software |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Capitalized computer software, additions |  |  |  |  |  | $ 28.0 | $ 47.9 |

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