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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
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |  |  |
Additional provisions | $ 25.4 | $ 26.9 |  | $ 82.1 | $ 118.5
Total |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | 36.6 |  | $ 44.4 |  |
Additional provisions | 15.8 |  |  |  |
Payments | (8.0) |  |  |  |
Changes in estimates | (0.5) |  |  |  |
Translation adjustments | 0.5 |  |  |  |
Balance at end of period | 44.4 |  |  | 36.6 |
Total | Forecast |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Payments |  |  | (22.4) |  |
Expected future utilization on balance at March 31, 2017 |  |  | 22.0 |  |
Work-Force Reductions | United States |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | 1.8 |  | 1.3 |  |
Additional provisions | 0.5 |  |  |  |
Payments | (0.9) |  |  |  |
Changes in estimates | (0.1) |  |  |  |
Translation adjustments | 0.0 |  |  |  |
Balance at end of period | 1.3 |  |  | 1.8 |
Work-Force Reductions | United States | Forecast |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Payments |  |  | (1.3) |  |
Expected future utilization on balance at March 31, 2017 |  |  | 0.0 |  |
Work-Force Reductions | International |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | 33.4 |  | 39.2 |  |
Additional provisions | 12.4 |  |  |  |
Payments | (6.8) |  |  |  |
Changes in estimates | (0.3) |  |  |  |
Translation adjustments | 0.5 |  |  |  |
Balance at end of period | 39.2 |  |  | 33.4 |
Work-Force Reductions | International | Forecast |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Payments |  |  | (20.2) |  |
Expected future utilization on balance at March 31, 2017 |  |  | 19.0 |  |
Idle Leased Facilities |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of period | 1.4 |  | 3.9 |  |
Additional provisions | 2.9 |  |  |  |
Payments | (0.3) |  |  |  |
Changes in estimates | (0.1) |  |  |  |
Translation adjustments | 0.0 |  |  |  |
Balance at end of period | $ 3.9 |  |  | $ 1.4 |
Idle Leased Facilities | Forecast |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Payments |  |  | (0.9) |  |
Expected future utilization on balance at March 31, 2017 |  |  | $ 3.0 |  |

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