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Restructuring and other - Restructuring and Other, By Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other | $ 27.8 | $ 7.8 | $ 1.1 | $ 9.2 | $ 36.3 | $ 13.8 | $ 4.2 | $ 2.7 | $ 45.9 | $ 57.0 | $ 21.9
Unallocated and Corporate |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 30.1 | 32.1 | 9.0
Gaming | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 7.7 | 14.6 | 11.2
Lottery | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 5.9 | 8.7 | 0.2
Interactive | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 2.2 | 1.6 | $ 1.5
November 2016 Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  | $ 22.4 |  |  |  | 2.2 | 0.0 |
November 2016 Plan | Unallocated and Corporate |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 0.8 | 0.0 |
November 2016 Plan | Gaming | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 1.1 | 0.0 |
November 2016 Plan | Lottery | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 0.2 | 0.0 |
November 2016 Plan | Interactive | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | $ 0.1 | $ 0.0 |

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