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Cost-reduction actions - Reconciliation of Liabilities and Expected Future Payments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Additional provisions | $ 22.8 | $ (0.9) | $ 0.7 | $ (2.9) | $ 47.8 | $ 46.1 | $ 27.5 | $ 25.4 |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 117.8 |  |  |  | 36.6 | $ 89.1 | $ 117.8 | $ 36.6 | $ 33.0
Additional provisions |  |  |  |  |  |  |  |  |  | 27.7 | 131.2 | 68.3
Payments |  |  |  |  |  |  |  |  |  | (44.4) | (49.3) | (59.3)
Changes in estimates |  |  |  |  |  |  |  |  |  | (8.0) | (8.6) | (4.3)
Translation adjustments |  |  |  |  |  |  |  |  |  | (4.0) | 7.9 | (1.1)
Balance at end of period | 89.1 |  |  |  | 117.8 |  |  |  |  | 89.1 | 117.8 | 36.6
In 2019 |  |  |  |  |  |  |  |  |  | 44.4 | 49.3 | 59.3
Total | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (75.8) |  |  |
In 2019 |  |  |  |  |  |  |  |  | 75.8 |  |  |
Beyond 2019 |  |  |  |  |  |  |  |  | 13.3 |  |  |
Work-Force Reductions | U.S. |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 3.9 |  |  |  | 1.8 | 6.1 | 3.9 | 1.8 | 4.2
Additional provisions |  |  |  |  |  |  |  |  |  | 5.2 | 9.4 | 8.3
Payments |  |  |  |  |  |  |  |  |  | (3.1) | (6.0) | (9.4)
Changes in estimates |  |  |  |  |  |  |  |  |  | 0.1 | (1.3) | (1.3)
Translation adjustments |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Balance at end of period | 6.1 |  |  |  | 3.9 |  |  |  |  | 6.1 | 3.9 | 1.8
In 2019 |  |  |  |  |  |  |  |  |  | 3.1 | 6.0 | 9.4
Work-Force Reductions | U.S. | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (5.6) |  |  |
In 2019 |  |  |  |  |  |  |  |  | 5.6 |  |  |
Beyond 2019 |  |  |  |  |  |  |  |  | 0.5 |  |  |
Work-Force Reductions | International |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 109.6 |  |  |  | 33.4 | 80.1 | 109.6 | 33.4 | 28.8
Additional provisions |  |  |  |  |  |  |  |  |  | 22.5 | 117.6 | 58.6
Payments |  |  |  |  |  |  |  |  |  | (39.3) | (41.3) | (49.9)
Changes in estimates |  |  |  |  |  |  |  |  |  | (8.8) | (7.8) | (3.0)
Translation adjustments |  |  |  |  |  |  |  |  |  | (3.9) | 7.7 | (1.1)
Balance at end of period | 80.1 |  |  |  | 109.6 |  |  |  |  | 80.1 | 109.6 | 33.4
In 2019 |  |  |  |  |  |  |  |  |  | 39.3 | 41.3 | 49.9
Work-Force Reductions | International | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (68.8) |  |  |
In 2019 |  |  |  |  |  |  |  |  | 68.8 |  |  |
Beyond 2019 |  |  |  |  |  |  |  |  | 11.3 |  |  |
Idle Leased Facilities Costs |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 4.3 |  |  |  | $ 1.4 | 2.9 | 4.3 | 1.4 | 0.0
Additional provisions |  |  |  |  |  |  |  |  |  | 0.0 | 4.2 | 1.4
Payments |  |  |  |  |  |  |  |  |  | (2.0) | (2.0) | 0.0
Changes in estimates |  |  |  |  |  |  |  |  |  | 0.7 | 0.5 | 0.0
Translation adjustments |  |  |  |  |  |  |  |  |  | (0.1) | 0.2 | 0.0
Balance at end of period | $ 2.9 |  |  |  | $ 4.3 |  |  |  |  | 2.9 | 4.3 | 1.4
In 2019 |  |  |  |  |  |  |  |  |  | $ 2.0 | $ 2.0 | $ 0.0
Idle Leased Facilities Costs | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |  | (1.4) |  |  |
In 2019 |  |  |  |  |  |  |  |  | 1.4 |  |  |
Beyond 2019 |  |  |  |  |  |  |  |  | $ 1.5 |  |  |

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