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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Employee Benefit Plans | 9. Employee Benefit Plans 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 The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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Namespace Prefix: | us-gaap_
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