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Retirement Plans and Other OCI and Asset Allocation (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
U.S. Pension Benefits |  |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |  |
Net (gain) loss |  | $ 1.3 | $ 4.3 |
Amortization of actuarial losses |  | (4.2) | (3.7) |
Amortization of prior service cost |  | (0.1) | (0.1) |
Foreign exchange effect |  | 0.0 | 0.0 |
Total recognized in other comprehensive income |  | (3.0) | 0.5 |
Amounts expected to be recognized as components of net periodic cost at the end of the period |  |  |  |
Actuarial net loss |  | 4.1 |  |
Prior service cost |  | 0.1 |  |
Total amount expected to be recognized as components of net periodic cost at the end of the period |  | 4.2 |  |
Accumulated Benefit Obligations in Excess of Plan Assets |  |  |  |
Projected benefit obligation |  | 167.6 | 174.0 |
Accumulated benefit obligation |  | 161.2 | 167.2 |
Fair value of plan assets |  | $ 117.1 | $ 123.1 |
Investment Strategy [Abstract] |  |  |  |
Expected return on plan assets |  | 7.00% | 7.50% | 7.50%
Non-U.S. Pension Benefits |  |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |  |
Net (gain) loss |  | $ 39.7 | $ (12.9) |
Amortization of actuarial losses |  | (5.6) | (7.5) |
Amortization of prior service cost |  | (2.3) | (0.1) |
Foreign exchange effect |  | (12.2) | (12.7) |
Total recognized in other comprehensive income |  | 19.6 | (33.2) |
Amounts expected to be recognized as components of net periodic cost at the end of the period |  |  |  |
Actuarial net loss |  | 3.3 |  |
Prior service cost |  | 0.0 |  |
Total amount expected to be recognized as components of net periodic cost at the end of the period |  | 3.3 |  |
Accumulated Benefit Obligations in Excess of Plan Assets |  |  |  |
Projected benefit obligation |  | 211.5 | 217.1 |
Accumulated benefit obligation |  | 209.7 | 214.9 |
Fair value of plan assets |  | $ 108.3 | $ 111.2 |
Investment Strategy [Abstract] |  |  |  |
Expected return on plan assets |  | 5.90% | 5.93% | 5.96%
U.S. Other Benefits |  |  |  |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income: |  |  |  |
Net (gain) loss |  | $ (0.6) | $ (0.5) |
Amortization of actuarial losses |  | 0.0 | 0.0 |
Amortization of prior service cost |  | 0.0 | 0.0 |
Foreign exchange effect |  | 0.0 | 0.0 |
Total recognized in other comprehensive income |  | (0.6) | $ (0.5) |
Amounts expected to be recognized as components of net periodic cost at the end of the period |  |  |  |
Actuarial net loss |  | 0.0 |  |
Prior service cost |  | 0.0 |  |
Total amount expected to be recognized as components of net periodic cost at the end of the period |  | $ 0.0 |  |
Equity Securities | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 32.00% | 31.00% |
Fixed Income Securities | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 68.00% | 69.00% |
Fixed Income Securities | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 72.00% |  |
Equity Funds | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 28.00% |  |
North America | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 7.00% |  |
Europe | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 93.00% |  |
Subsequent Event | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Expected return on plan assets | 7.00% |  |  |
Subsequent Event | Minimum | Equity Securities | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 22.00% |  |  |
Subsequent Event | Minimum | Equity Securities | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 34.00% |  |  |
Subsequent Event | Minimum | Fixed Income Securities | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 64.00% |  |  |
Subsequent Event | Minimum | Fixed Income Securities | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 65.00% |  |  |
Subsequent Event | Maximum | Equity Securities | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 36.00% |  |  |
Subsequent Event | Maximum | Equity Securities | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 35.00% |  |  |
Subsequent Event | Maximum | Fixed Income Securities | U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 78.00% |  |  |
Subsequent Event | Maximum | Fixed Income Securities | Non-U.S. Pension Benefits |  |  |  |
Investment Strategy [Abstract] |  |  |  |
Target plan asset allocations | 66.00% |  |  |

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