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Benefit Plans and Other Postretirement Benefits, Benefit obligation and plan assets (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Accrued pension and postretirement benefit obligations |  | $ 272.0 | $ 288.4 |
Accumulated other comprehensive loss, net |  | $ (201.0) | $ (469.0) |
U.S. |  |  |  |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Rate of compensation increase (as a percent) |  | 3.00% | 3.00% |
International Plans |  |  |  |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Rate of compensation increase (as a percent) |  | 1.70% | 1.63% |
Pension Benefits |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | $ 741.7 | $ 703.3 | $ 635.2 |
Service cost |  | 9.6 | 9.0 | $ 9.3
Interest cost |  | 20.0 | 20.9 | 22.8
Acquisitions |  |  | 47.4 |
Plan amendments |  |  | 3.7 |
Actuarial (gain) loss |  | 18.9 | 39.6 |
Foreign exchange translation |  | 26.7 | (17.3) |
Benefits paid |  | (36.8) | (35.2) |
Projected benefit obligation at end of year |  | 741.7 | 703.3 | 635.2
Change in plan assets: |  |  |  |
Fair value of plan assets at the beginning of the year | 497.9 | 439.9 | 392.2 |
Actual return on plan assets |  | 62.4 | 31.8 |
Employer contributions |  | 22.5 | 22.2 | 20.9
Acquisitions |  |  | 36.7 |
Foreign exchange translation |  | 9.9 | (7.8) |
Benefits paid |  | (36.8) | (35.2) |
Fair value of plan assets at end of year |  | 497.9 | 439.9 | 392.2
Underfunded status at end of year |  | 243.8 | 263.4 |
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Other accrued expenses |  | 3.1 | 2.8 |
Accrued pension and postretirement benefit obligations |  | 240.7 | 260.6 |
Accumulated other comprehensive loss, net |  | (164.4) | (191.8) |
Accumulated benefit obligation |  |  |  |
Accumulated benefit obligation |  | 731.2 | 691.1 |
Pension Benefits | U.S. |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | 486.7 | 469.8 | 460.8 |
Service cost |  | 6.7 | 6.2 | 6.5
Interest cost |  | 15.3 | 15.4 | 17.4
Plan amendments |  |  | 3.7 |
Actuarial (gain) loss |  | 21.1 | 11.6 |
Benefits paid |  | (26.2) | (27.9) |
Projected benefit obligation at end of year |  | 486.7 | 469.8 | 460.8
Change in plan assets: |  |  |  |
Fair value of plan assets at the beginning of the year | 389.6 | 342.1 | 333.2 |
Actual return on plan assets |  | 57.2 | 20.4 |
Employer contributions | 80.0 | 16.5 | 16.4 |
Benefits paid |  | (26.2) | (27.9) |
Fair value of plan assets at end of year |  | 389.6 | 342.1 | 333.2
Underfunded status at end of year |  | 97.1 | 127.7 |
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Accrued pension and postretirement benefit obligations |  | 97.1 | 127.7 |
Accumulated other comprehensive loss, net |  | $ (110.5) | $ (129.3) |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Benefit obligation discount rate (as a percent) |  | 3.48% | 3.93% |
Accumulated benefit obligation |  |  |  |
Accumulated benefit obligation |  | $ 484.4 | $ 465.8 |
Pension Benefits | International Plans |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | 255.0 | 233.5 | 174.4 |
Service cost |  | 2.9 | 2.8 | 2.8
Interest cost |  | 4.7 | 5.5 | 5.4
Acquisitions |  |  | 47.4 |
Actuarial (gain) loss |  | (2.2) | 28.0 |
Foreign exchange translation |  | 26.7 | (17.3) |
Benefits paid |  | (10.6) | (7.3) |
Projected benefit obligation at end of year |  | 255.0 | 233.5 | 174.4
Change in plan assets: |  |  |  |
Fair value of plan assets at the beginning of the year | 108.3 | 97.8 | 59.0 |
Actual return on plan assets |  | 5.2 | 11.4 |
Employer contributions |  | 6.0 | 5.8 |
Acquisitions |  |  | 36.7 |
Foreign exchange translation |  | 9.9 | (7.8) |
Benefits paid |  | (10.6) | (7.3) |
Fair value of plan assets at end of year |  | 108.3 | 97.8 | $ 59.0
Underfunded status at end of year |  | 146.7 | 135.7 |
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Other accrued expenses |  | 3.1 | 2.8 |
Accrued pension and postretirement benefit obligations |  | 143.6 | 132.9 |
Accumulated other comprehensive loss, net |  | $ (53.9) | $ (62.5) |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Benefit obligation discount rate (as a percent) |  | 2.21% | 2.28% |
Accumulated benefit obligation |  |  |  |
Accumulated benefit obligation |  | $ 246.8 | $ 225.3 |
Largest international pension plan | Pension Benefits | Unfunded Plan | International Plans |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | $ 93.0 | 81.7 |  |
Projected benefit obligation at end of year |  | $ 93.0 | $ 81.7 |

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