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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Components of Net Periodic Cost for Defined Benefit Pension Plan and Other Postretirement Benefit Plan | The components of net periodic cost for our defined benefit pension plan and for our postretirement benefit plan are included in the following tables:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
Net Periodic Pension Cost |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Interest cost |  | $ | 4.1 |  |  | $ | 4.3 |  |  | $ | 8.2 |  |  | $ | 8.6 |
Actuarial loss amortization |  |  | 3.6 |  |  |  | 3.2 |  |  |  | 7.2 |  |  |  | 6.4 |
Less: Expected return on plan assets |  |  | (6.5 | ) |  |  | (6.6 | ) |  |  | (13.0 | ) |  |  | (13.2 | )
Net periodic pension cost |  | $ | 1.2 |  |  | $ | 0.9 |  |  | $ | 2.4 |  |  | $ | 1.8 |
Net Periodic Postretirement Benefit |  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service benefit |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (0.2 | )
Interest cost |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.2 |
Actuarial gain amortization |  |  | (0.6 | ) |  |  | (0.6 | ) |  |  | (1.2 | ) |  |  | (1.2 | )
Net periodic postretirement benefit gain |  | $ | (0.6 | ) |  | $ | (0.6 | ) |  | $ | (1.2 | ) |  | $ | (1.2 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration