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Cost reduction actions - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) Employee | Dec. 31, 2015 USD ($) Employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Estimated future restructuring charges |  |  |  |  | $ 300.0 |  |  |  | $ 300.0
Restructuring charges | $ 13.1 | $ 31.9 | $ 10.2 | $ 26.9 | $ 48.5 | $ 17.4 | $ 52.6 | $ 82.1 | 118.5
Severance costs |  |  |  |  |  |  |  | 62.6 | 78.8
Asset impairments and other expenses related to the cost reduction effort |  |  |  |  |  |  |  | 19.5 | 39.7
Asset impairment charges |  |  |  |  |  |  |  |  | 20.2
Cost of revenue | Services |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 42.4 | 52.3
Cost of revenue | Technology |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 0.3
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 38.0 | 53.5
Research and development expenses |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 1.7 | 12.4
Other expenses related to the cost reduction effort |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 13.3 | 19.5
Net asset sales and write-offs |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 0.7 |
Idle leased facilities and contract amendment and termination |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | 5.5 |
United States |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  | $ 7.0 | $ 27.9
Number of employees | Employee |  |  |  |  |  |  |  | 351 | 700
Non-US |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  | $ 55.6 | $ 50.9
Number of employees | Employee |  |  |  |  |  |  |  | 1,048 | 782

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