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Pension and Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assumed health care cost trend rate | 7.50% | 7.00% |
Decrease in assumed health care cost trend rate | 4.50% | 4.50% |
Effect of one percentage point increase on accumulated post retirement benefit obligation | $ 1.4 |  |
Effect of one percentage point increase in assumed health care cost trend rate on total service and interest cost components | 0.1 |  |
Effect of one percentage point decrease in assumed health care cost trend rate on accumulated post retirement benefit obligation | 1.1 |  |
Effect of one percentage point decrease in assumed health care cost trend rate on total service and interest cost components | $ 0.1 |  |
Maximum percentage of funding status of plans in red zone | 65.00% |  |
Maximum percentage of funding status of plans in yellow zone | 80.00% |  |
Maximum percentage of funding status of plans in green zone | 80.00% |  |
401(k) plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of employer matching contribution with employee gross pay | 100.00% |  |
Percentage of employer matching contribution match with 100 percent | 3.00% |  |
Percentage of employer matching contribution | 50.00% |  |
Percentage of employer matching contribution match with 50 percent | 2.00% |  |
Expense associated with other employee benefit plans | $ 4.2 | $ 3.9 | $ 3.7
Domestic Plans | Unfunded Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated net actuarial loss for pension plans that is expected to be amortized | 0.1 |  |
Domestic Plans | Funded Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated net actuarial loss for pension plans that is expected to be amortized | 0.4 |  |
Foreign Pension Plans | Funded Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial losses for the foreign funded plans recognized in AOCI (before tax) | (2.5) | (3.3) |
Net actuarial losses for the foreign funded plans recognized in AOCI (after tax) | (1.8) | (2.5) |
Foreign Pension Plans | Unfunded Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial losses for the foreign unfunded plans recognized in AOCI (before tax) | (0.7) | (0.4) |
Net actuarial losses for the foreign unfunded plans recognized in AOCI (after tax) | (0.5) | $ (0.3) |
Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount expected to contribute in postretirement benefit plans | 1.1 |  |
Postretirement Benefit Plans | Domestic Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated net actuarial loss for pension plans that is expected to be amortized | 0.2 |  |
Estimated prior service credit for postretirement benefit plans | 0.2 |  |
Pension Plans | Unfunded Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount expected to contribute in unfunded pension plans | 1.0 |  |
Pension Plans | Funded Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount expected to contribute in funded pension plans | $ 1.1 |  |

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