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Cost reduction actions - Individual Components of Work Force Reduction and Idle Lease Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Charges for work-force reductions / Additional provisions | $ 13.1 | $ 31.9 | $ 10.2 | $ 26.9 | $ 48.5 | $ 17.4 | $ 52.6 |  | $ 82.1 | $ 118.5
Work-force reduction costs |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 33.0 |  |  |  | $ 35.2 | 33.0 |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  | 66.9 | 78.8
Payments |  |  |  |  |  |  |  |  | (59.3) | (45.3)
Changes in estimates |  |  |  |  |  |  |  |  | (4.3) |
Translation adjustments |  |  |  |  |  |  |  |  | (1.1) | (0.5)
Balance at end of period | 35.2 |  |  |  | 33.0 |  |  |  | 35.2 | 33.0
Work-force reduction costs | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  | (21.2) |  |
Expected future payments on balance at December 31, 2016 |  |  |  |  |  |  |  | 14.0 |  |
Work-force reduction costs | United States |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 4.2 |  |  |  | 1.8 | 4.2 |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  | 8.3 | 27.9
Payments |  |  |  |  |  |  |  |  | (9.4) | (23.7)
Changes in estimates |  |  |  |  |  |  |  |  | (1.3) |
Balance at end of period | 1.8 |  |  |  | 4.2 |  |  |  | 1.8 | 4.2
Work-force reduction costs | United States | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  | (1.8) |  |
Expected future payments on balance at December 31, 2016 |  |  |  |  |  |  |  | 0.0 |  |
Work-force reduction costs | International |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 28.8 |  |  |  | 33.4 | 28.8 |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  | 58.6 | 50.9
Payments |  |  |  |  |  |  |  |  | (49.9) | (21.6)
Changes in estimates |  |  |  |  |  |  |  |  | (3.0) |
Translation adjustments |  |  |  |  |  |  |  |  | (1.1) | (0.5)
Balance at end of period | $ 33.4 |  |  |  | $ 28.8 |  |  |  | $ 33.4 | $ 28.8
Work-force reduction costs | International | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  | (19.4) |  |
Expected future payments on balance at December 31, 2016 |  |  |  |  |  |  |  | $ 14.0 |  |

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