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Cost reduction actions - Reconciliation of Liabilities and Expected Future Payments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Charges for work-force reductions / Additional provisions | $ 47.8 | $ 46.1 | $ 27.5 | $ 25.4 | $ 13.1 | $ 31.9 | $ 10.2 | $ 26.9 |  | $ 146.8 | $ 82.1 | $ 118.5 | $ 347.4
Work-Force Reductions | United States |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1.8 |  |  |  | 4.2 | $ 3.9 | 1.8 | 4.2 |  |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  |  | 9.4 | 8.3 | 27.9 |
Payments |  |  |  |  |  |  |  |  |  | (6.0) | (9.4) | (23.7) |
Changes in estimates |  |  |  |  |  |  |  |  |  | (1.3) | (1.3) |  |
Translation adjustments |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 |  |
Balance at end of period | 3.9 |  |  |  | 1.8 |  |  |  |  | 3.9 | 1.8 | 4.2 | 3.9
In 2018 |  |  |  |  |  |  |  |  |  | 6.0 | 9.4 | 23.7 |
Work-Force Reductions | United States | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (3.9) |  |  |  |
In 2018 |  |  |  |  |  |  |  |  | 3.9 |  |  |  |
Expected future payments on balance at December 31, 2017 |  |  |  |  |  |  |  |  | 0.0 |  |  |  |
Work-Force Reductions | International |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 33.4 |  |  |  | 28.8 | 109.6 | 33.4 | 28.8 |  |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  |  | 117.6 | 58.6 | 50.9 |
Payments |  |  |  |  |  |  |  |  |  | (41.3) | (49.9) | (21.6) |
Changes in estimates |  |  |  |  |  |  |  |  |  | (7.8) | (3.0) |  |
Translation adjustments |  |  |  |  |  |  |  |  |  | 7.7 | (1.1) | (0.5) |
Balance at end of period | 109.6 |  |  |  | 33.4 |  |  |  |  | 109.6 | 33.4 | 28.8 | 109.6
In 2018 |  |  |  |  |  |  |  |  |  | 41.3 | 49.9 | 21.6 |
Work-Force Reductions | International | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (82.0) |  |  |  |
In 2018 |  |  |  |  |  |  |  |  | 82.0 |  |  |  |
Expected future payments on balance at December 31, 2017 |  |  |  |  |  |  |  |  | 27.6 |  |  |  |
Idle Leased Facilities Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1.4 |  |  |  | 0.0 | 4.3 | 1.4 | 0.0 |  |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  |  | 4.2 | 1.4 | 0.0 |
Payments |  |  |  |  |  |  |  |  |  | (2.0) | 0.0 | 0.0 |
Changes in estimates |  |  |  |  |  |  |  |  |  | 0.5 | 0.0 |  |
Translation adjustments |  |  |  |  |  |  |  |  |  | 0.2 | 0.0 | 0.0 |
Balance at end of period | 4.3 |  |  |  | 1.4 |  |  |  |  | 4.3 | 1.4 | 0.0 | 4.3
In 2018 |  |  |  |  |  |  |  |  |  | 2.0 | 0.0 | 0.0 |
Idle Leased Facilities Costs | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (1.8) |  |  |  |
In 2018 |  |  |  |  |  |  |  |  | 1.8 |  |  |  |
Expected future payments on balance at December 31, 2017 |  |  |  |  |  |  |  |  | 2.5 |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 36.6 |  |  |  | $ 33.0 | 117.8 | 36.6 | 33.0 |  |
Charges for work-force reductions / Additional provisions |  |  |  |  |  |  |  |  |  | 131.2 | 68.3 | 78.8 |
Payments |  |  |  |  |  |  |  |  |  | (49.3) | (59.3) | (45.3) |
Changes in estimates |  |  |  |  |  |  |  |  |  | (8.6) | (4.3) |  |
Translation adjustments |  |  |  |  |  |  |  |  |  | 7.9 | (1.1) | (0.5) |
Balance at end of period | $ 117.8 |  |  |  | $ 36.6 |  |  |  |  | 117.8 | 36.6 | 33.0 | $ 117.8
In 2018 |  |  |  |  |  |  |  |  |  | $ 49.3 | $ 59.3 | $ 45.3 |
Total | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (87.7) |  |  |  |
In 2018 |  |  |  |  |  |  |  |  | 87.7 |  |  |  |
Expected future payments on balance at December 31, 2017 |  |  |  |  |  |  |  |  | $ 30.1 |  |  |  |

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