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Cost Reduction Actions - Individual Components of Work Force Reduction and Idle Lease Cost (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Additional provisions |  | $ 46.1 | $ 31.9 | $ 99.0 | $ 69.0 | $ 82.1 | $ 118.5
Total |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | $ 104.4 |  |  | 36.6 |  |  |
Additional provisions |  |  |  | 91.9 |  |  |
Payments |  |  |  | (28.7) |  |  |
Changes in estimates |  |  |  | (2.0) |  |  |
Translation adjustments |  |  |  | 6.6 |  |  |
Balance at end of period |  | 104.4 |  | 104.4 |  | 36.6 |
Total | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments | (30.1) |  |  |  |  |  |
Expected future utilization on balance at September 30, 2017 | 74.3 |  |  |  |  |  |
Work-Force Reductions | U.S. |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | 5.6 |  |  | 1.8 |  |  |
Additional provisions |  |  |  | 7.9 |  |  |
Payments |  |  |  | (3.5) |  |  |
Changes in estimates |  |  |  | (0.6) |  |  |
Translation adjustments |  |  |  | 0.0 |  |  |
Balance at end of period |  | 5.6 |  | 5.6 |  | 1.8 |
Work-Force Reductions | U.S. | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments | (3.5) |  |  |  |  |  |
Expected future utilization on balance at September 30, 2017 | 2.1 |  |  |  |  |  |
Work-Force Reductions | International |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | 94.9 |  |  | 33.4 |  |  |
Additional provisions |  |  |  | 80.5 |  |  |
Payments |  |  |  | (23.8) |  |  |
Changes in estimates |  |  |  | (1.6) |  |  |
Translation adjustments |  |  |  | 6.4 |  |  |
Balance at end of period |  | 94.9 |  | 94.9 |  | 33.4 |
Work-Force Reductions | International | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments | (25.9) |  |  |  |  |  |
Expected future utilization on balance at September 30, 2017 | 69.0 |  |  |  |  |  |
Idle Leased Facilities Costs |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | 3.9 |  |  | 1.4 |  |  |
Additional provisions |  |  |  | 3.5 |  |  |
Payments |  |  |  | (1.4) |  |  |
Changes in estimates |  |  |  | 0.2 |  |  |
Translation adjustments |  |  |  | 0.2 |  |  |
Balance at end of period |  | $ 3.9 |  | $ 3.9 |  | $ 1.4 |
Idle Leased Facilities Costs | Forecast |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Payments | (0.7) |  |  |  |  |  |
Expected future utilization on balance at September 30, 2017 | $ 3.2 |  |  |  |  |  |

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