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Defined Benefit Plan (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Components of net periodic benefit cost | The components of net periodic benefit cost follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 0.8 |  |  | $ | 0.6 |  |  | $ | 1.6 |  |  | $ | 1.3 |
Interest cost |  | 1.4 |  |  | 1.3 |  |  | 2.8 |  |  | 2.6 |
Expected return on plan assets |  | (2.6 | ) |  | (2.6 | ) |  | (5.2 | ) |  | (5.1 | )
Amortization of unrecognized loss (1) |  | 1.2 |  |  | 0.7 |  |  | 2.3 |  |  | 1.3 |
Net periodic benefit cost |  | $ | 0.8 |  |  | $ | — |  |  | $ | 1.5 |  |  | $ | 0.1 |
(1) Includes amortization of unrecognized actuarial (gain) loss and prior service credits and excludes provision for income tax of $(0.3) million for the six months ended June 30, 2018, and $(0.3) million and $(0.5) million for the three and six months ended June 30, 2017, respectively.

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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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