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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Accrued pension and postretirement benefit obligations |  | $ 198.8 | $ 190.2 |
Accumulated other comprehensive loss, net |  | $ (430.9) | $ (390.2) |
United States |  |  |  |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Rate of compensation increase (as a percent) |  | 2.60% | 3.00% |
Foreign. |  |  |  |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Rate of compensation increase (as a percent) |  | 1.78% | 1.77% |
Pension Benefits |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | $ 741.7 | $ 684.2 | $ 741.7 |
Service cost |  | 8.0 | 7.3 | $ 9.6
Interest cost |  | 21.5 | 19.6 | 20.0
Plan amendments |  | 4.8 | 1.0 |
Actuarial (gain) loss |  | 71.9 | (36.2) |
Foreign exchange translation |  | 1.6 | (13.0) |
Benefits paid |  | (34.1) | (36.2) |
Projected benefit obligation at end of year |  | 757.9 | 684.2 | 741.7
Change in plan assets: |  |  |  |
Fair value of plan assets at the beginning of the year | 497.9 | 514.1 | 497.9 |
Actual return on plan assets |  | 91.9 | (29.7) |
Employer contributions |  | 6.6 | 88.3 | 22.5
Foreign exchange translation |  | 2.5 | (6.2) |
Benefits paid |  | (34.1) | (36.2) |
Fair value of plan assets at end of year |  | 581.0 | 514.1 | 497.9
Underfunded status at end of year |  | 176.9 | 170.1 |
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Other accrued expenses |  | 4.2 | 3.9 |
Accrued pension and postretirement benefit obligations |  | 172.7 | 166.2 |
Accumulated other comprehensive loss, net |  | (193.5) | (192.9) |
Accumulated benefit obligation |  |  |  |
Accumulated benefit obligation |  | 748.4 | 674.5 |
Pension Benefits | United States |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | 486.7 | 448.9 | 486.7 |
Service cost |  | 5.4 | 4.5 | 6.7
Interest cost |  | 16.8 | 14.9 | 15.3
Plan amendments |  | 4.8 | 0.2 |
Actuarial (gain) loss |  | 47.1 | (33.1) |
Foreign exchange translation |  | 0.0 | 0.0 |
Benefits paid |  | (26.5) | (24.3) |
Projected benefit obligation at end of year |  | 496.5 | 448.9 | 486.7
Change in plan assets: |  |  |  |
Fair value of plan assets at the beginning of the year | 389.6 | 418.2 | 389.6 |
Actual return on plan assets |  | 80.5 | (28.8) |
Employer contributions | 81.0 | 1.0 | 81.7 |
Foreign exchange translation |  | 0.0 | 0.0 |
Benefits paid |  | (26.5) | (24.3) |
Fair value of plan assets at end of year |  | 473.2 | 418.2 | 389.6
Underfunded status at end of year |  | 23.3 | 30.7 |
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Other accrued expenses |  | 1.0 | 1.0 |
Accrued pension and postretirement benefit obligations |  | 22.3 | 29.7 |
Accumulated other comprehensive loss, net |  | $ (131.5) | $ (140.2) |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Benefit obligation discount rate (as a percent) |  | 3.11% | 4.14% |
Increase (decrease) in benefit obligation due to change in discount rate |  | $ 50.0 |  |
Accumulated benefit obligation |  |  |  |
Accumulated benefit obligation |  | 495.0 | $ 446.4 |
Pension Benefits | Foreign. |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | 255.0 | 235.3 | 255.0 |
Service cost |  | 2.6 | 2.8 | 2.9
Interest cost |  | 4.7 | 4.7 | 4.7
Plan amendments |  | 0.0 | 0.8 |
Actuarial (gain) loss |  | 24.8 | (3.1) |
Foreign exchange translation |  | 1.6 | (13.0) |
Benefits paid |  | (7.6) | (11.9) |
Projected benefit obligation at end of year |  | 261.4 | 235.3 | 255.0
Change in plan assets: |  |  |  |
Fair value of plan assets at the beginning of the year | $ 108.3 | 95.9 | 108.3 |
Actual return on plan assets |  | 11.4 | (0.9) |
Employer contributions |  | 5.6 | 6.6 |
Foreign exchange translation |  | 2.5 | (6.2) |
Benefits paid |  | (7.6) | (11.9) |
Fair value of plan assets at end of year |  | 107.8 | 95.9 | $ 108.3
Underfunded status at end of year |  | 153.6 | 139.4 |
Amounts recognized in the balance sheet as of December 31: |  |  |  |
Other accrued expenses |  | 3.2 | 2.9 |
Accrued pension and postretirement benefit obligations |  | 150.4 | 136.5 |
Accumulated other comprehensive loss, net |  | $ (62.0) | $ (52.7) |
Weighted average assumptions used to determine projected benefit obligations: |  |  |  |
Benefit obligation discount rate (as a percent) |  | 1.59% | 2.28% |
Accumulated benefit obligation |  |  |  |
Accumulated benefit obligation |  | $ 253.4 | $ 228.1 |
Largest foreign pension plan | Pension Benefits | Unfunded Plan | Foreign. |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year |  | 92.7 |  |
Projected benefit obligation at end of year |  | $ 103.6 | $ 92.7 |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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