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Segment Information - Reconciliation of Segment Operating Income to Consolidated Loss Before Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating profit (loss) | $ (27.0) | $ (9.8) | $ (54.5) | $ 12.1 |  |
Interest expense | (16.4) | (7.7) | (36.4) | (19.9) |  |
Other income (expense), net | 3.0 | 2.3 | (8.6) | 3.7 |  |
Cost reduction charges | (46.1) | (31.9) | (99.0) | (69.0) | $ (82.1) | $ (118.5)
Total loss before income taxes | (40.4) | (15.2) | (99.5) | (4.1) |  |
Other income (expense), net |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Cost reduction charges | 5.7 |  | 0.6 |  |  |
Other income (expense), net | Net foreign currency translation adjustment |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Cost reduction charges | (5.7) |  | (0.6) |  |  |
Operating Segments |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating profit (loss) | 48.3 | 44.1 | 113.6 | 142.4 |  |
Segment Reconciling Items |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Cost reduction charges | (51.8) | (31.9) | (99.6) | (69.0) |  |
Corporate and eliminations |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating profit (loss) | $ (23.5) | $ (22.0) | $ (68.5) | $ (61.3) |  |

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