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Employee Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Components of net retirement cost | The following table summarizes the components of our net retirement cost:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (in millions)
Expense Components |  |  |  |  |  |  |
Service cost | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest | 4.9 |  |  | 4.6 |  |  | 9.8 |  |  | 9.1 |
Expected return on plan assets | (5.8 | ) |  | (6.9 | ) |  | (11.5 | ) |  | (13.7 | )
Amortization of actuarial loss | 1.1 |  |  | 1.1 |  |  | 2.2 |  |  | 2.3 |
Net periodic benefit cost | 0.3 |  |  | (1.1 | ) |  | 0.6 |  |  | (2.2 | )
Profit sharing | 3.0 |  |  | 2.5 |  |  | 5.2 |  |  | 5.0 |
Net expense | $ | 3.3 |  |  | $ | 1.4 |  |  | $ | 5.8 |  |  | $ | 2.8 |

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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