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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic pension expense are as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Interest cost | $ | 2.2 |  |  | $ | 2.3 |  |  | $ | 2.3 |
Expected return on plan assets | (2.8 | ) |  | (2.8 | ) |  | (3.2 | )
Amortization of net loss | 1.2 |  |  | 1.5 |  |  | 1.4 |
Total net periodic pension expense | $ | 0.6 |  |  | $ | 1.0 |  |  | $ | 0.5 |
Schedule of Changes in Projected Benefit Obligation and Plan Assets, Funded Status and Amounts Recognized on the Balance Sheet | The changes in the projected benefit obligation and plan assets, the funded status of the plans and the amounts recognized in the consolidated balance sheets are as follows:
| December 31,
| 2017 |  | 2016
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ | 55.5 |  |  | $ | 58.3 |
Interest cost | 2.2 |  |  | 2.3 |
Benefits paid | (2.3 | ) |  | (3.9 | )
Actuarial gains (losses) | 1.6 |  |  | (1.2 | )
Projected benefit obligation at year end | $ | 57.0 |  |  | $ | 55.5 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | $ | 41.1 |  |  | $ | 41.0 |
Actual return | 6.7 |  |  | 3.0 |
Employer contributions | 3.0 |  |  | 1.0 |
Benefits paid | (2.3 | ) |  | (3.9 | )
Fair value of plan assets at year end | $ | 48.5 |  |  | $ | 41.1 |
Funded status (Accrued pension liabilities) (1) | $ | (8.5 | ) |  | $ | (14.4 | )
Unrecognized actuarial loss recognized in accumulated other comprehensive loss | $ | 13.2 |  |  | $ | 16.7 |
Schedule of Assumptions Used | The actuarial assumptions used in determining pension plan information are as follows:
| December 31,
| 2017 |  | 2016 |  | 2015
Assumptions used to determine benefit obligation at year end: |  |  |  |  |
Discount rate | 3.7 | % |  | 4.0 | % |  | 4.0 | %
Assumptions used to determine net periodic benefit cost: |  |  |  |  |
Discount rate | 4.0 | % |  | 4.0 | % |  | 3.8 | %
Expected long-term weighted-average rate of return on plan assets | 7.0 | % |  | 7.0 | % |  | 7.3 | %
Schedule of Allocation of Plan Assets [Table Text Block] | The target allocations by asset category and fair values of the plan assets by asset class at December 31 are as follows:
| Target Allocations by Asset Category |  | Fair Value
|  | Total |  | Level 2 |  | Level 3
Plan Assets: |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Equity funds | 60% – 68% |  | $ | 33.0 |  |  | $ | 28.1 |  |  | $ | 33.0 |  |  | $ | 28.1 |  |  | $ | — |  |  | $ | — |
Fixed income funds | 26% – 30% |  | 12.6 |  |  | 11.7 |  |  | 12.6 |  |  | 11.7 |  |  | — |  |  | — |
Other investments | 3% – 6% |  | 2.9 |  |  | 1.3 |  |  | — |  |  | — |  |  | 2.9 |  |  | 1.3 |
Total |  |  | $ | 48.5 |  |  | $ | 41.1 |  |  | $ | 45.6 |  |  | $ | 39.8 |  |  | $ | 2.9 |  |  | $ | 1.3 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The following table represents changes in the fair value of plan assets categorized as Level 3 from the preceding table:
Balance at January 1, 2016 | $ | 0.3 |
Purchases, sales and settlements, net | (4.2 | )
Transfers, net | 5.2 |
Balance at December 31, 2016 | $ | 1.3 |
Purchases, sales and settlements, net | (2.4 | )
Transfers, net | 4.0 |
Balance at December 31, 2017 | $ | 2.9 |
Schedule of Expected Benefit Payments | The following benefit payments are expected to be paid by the plan in each of the next five years and in the aggregate for the subsequent five years:
2018 | $ | 2.6 |
2019 | 2.8 |
2020 | 2.9 |
2021 | 3.0 |
2022 | 3.1 |
In aggregate during five years thereafter | 16.6 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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