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Cost Reduction Actions - Individual Components of Work Force Reduction and Idle Lease Cost (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Additional provisions | $ 27.5 | $ 10.2 |  | $ 52.9 | $ 37.1 | $ 82.1 | $ 118.5
Total |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  |  | $ 67.2 | 36.6 |  |  |
Additional provisions |  |  |  | 40.4 |  |  |
Payments |  |  |  | (12.9) |  |  |
Changes in estimates |  |  |  | (0.8) |  |  |
Translation adjustments |  |  |  | 3.9 |  |  |
Balance at end of period | 67.2 |  |  | 67.2 |  | 36.6 |
Total | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  | (29.3) |  |  |  |
Expected future utilization on balance at June 30, 2017 |  |  | 37.9 |  |  |  |
Work-Force Reductions | United States |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  |  | 5.2 | 1.8 |  |  |
Additional provisions |  |  |  | 5.3 |  |  |
Payments |  |  |  | (1.7) |  |  |
Changes in estimates |  |  |  | (0.2) |  |  |
Translation adjustments |  |  |  | 0.0 |  |  |
Balance at end of period | 5.2 |  |  | 5.2 |  | 1.8 |
Work-Force Reductions | United States | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  | (5.2) |  |  |  |
Expected future utilization on balance at June 30, 2017 |  |  | 0.0 |  |  |  |
Work-Force Reductions | International |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  |  | 58.2 | 33.4 |  |  |
Additional provisions |  |  |  | 32.2 |  |  |
Payments |  |  |  | (10.5) |  |  |
Changes in estimates |  |  |  | (0.6) |  |  |
Translation adjustments |  |  |  | 3.7 |  |  |
Balance at end of period | 58.2 |  |  | 58.2 |  | 33.4 |
Work-Force Reductions | International | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  | (23.3) |  |  |  |
Expected future utilization on balance at June 30, 2017 |  |  | 34.9 |  |  |  |
Idle Leased Facilities Costs |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  |  | 3.8 | 1.4 |  |  |
Additional provisions |  |  |  | 2.9 |  |  |
Payments |  |  |  | (0.7) |  |  |
Changes in estimates |  |  |  | 0.0 |  |  |
Translation adjustments |  |  |  | 0.2 |  |  |
Balance at end of period | $ 3.8 |  |  | $ 3.8 |  | $ 1.4 |
Idle Leased Facilities Costs | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments |  |  | (0.8) |  |  |  |
Expected future utilization on balance at June 30, 2017 |  |  | $ 3.0 |  |  |  |

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