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Cost Reduction Actions - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) employee | Jun. 30, 2016 USD ($) employee | Jun. 30, 2017 USD ($) employee | Jun. 30, 2016 USD ($) employee | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Estimated pretax restructuring charges |  |  |  |  |  | $ 300.0
Restructuring charges | $ 27.5 | $ 10.2 | $ 52.9 | $ 37.1 | $ 82.1 | $ 118.5
Severance costs | 24.2 | 6.5 | 36.7 | 28.6 |  |
Other expenses related to the cost reduction effort | 3.3 | 3.7 | 16.2 | 8.5 |  |
Cost of Revenue | Services |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 19.1 | 5.1 | 27.6 | 16.6 |  |
Cost of Revenue | Technology |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 0.4 |  | 0.4 |  |  |
Selling, general and administrative expenses |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | 8.2 | 5.5 | 19.5 | 18.8 |  |
Research and development expenses |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  | 0.4 | 0.3 | 1.7 |  |
Other income (expense), net |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | (0.2) |  | 5.1 |  |  |
Idle leased facilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | 2.9 |  |  |
Other expenses related to the cost reduction effort |  |  | 2.9 |  |  |
Contract amendment and termination |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Other expenses related to the cost reduction effort | 1.9 |  | 5.2 |  |  |
Professional fees and other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Other expenses related to the cost reduction effort | 1.6 |  | 3.0 |  |  |
Foreign currency translation adjustment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Other expenses related to the cost reduction effort | (0.2) |  | 5.1 |  |  |
Foreign currency translation adjustment | Other income (expense), net |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | (0.2) |  | 5.1 |  |  |
United States |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance costs | $ 4.8 | $ 1.2 | $ 5.3 | $ 5.4 |  |
Number of employees | employee | 369 | 69 | 414 | 244 |  |
United States | Changes in estimates |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance costs | $ (0.1) |  | $ (0.2) |  |  |
Non-US |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance costs | $ 19.8 | $ 5.3 | $ 24.0 | $ 23.2 |  |
Number of employees | employee | 301 | 262 | 376 | 599 |  |
Non-US | Changes in estimates |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance costs | $ (0.3) |  | $ (0.6) |  |  |
Non-US | Additional benefits provided in 2017 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance costs |  |  | $ 8.2 |  |  |

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