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Employee Benefit Plans and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Costs | The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):
|  | Pension Plans |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 6.2 |  |  | $ | 6.1 |  |  | $ | 12.4 |  |  | $ | 12.2 |
Interest cost |  |  | 10.6 |  |  |  | 10.4 |  |  |  | 21.3 |  |  |  | 20.8 |
Expected return on plan assets |  |  | (14.2 | ) |  |  | (13.5 | ) |  |  | (28.3 | ) |  |  | (27.0 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 1.8 |  |  |  | 1.5 |  |  |  | 3.4 |  |  |  | 3.0 |
Actuarial loss |  |  | 2.3 |  |  |  | 1.9 |  |  |  | 4.6 |  |  |  | 3.7 |
Net periodic benefit cost |  | $ | 6.7 |  |  | $ | 6.4 |  |  | $ | 13.4 |  |  | $ | 12.7 |
The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
|  | Postretirement Plans |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.3 |
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.1 | )
Net periodic benefit cost |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.4 |

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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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