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Pension plans (Tables) | 9 Months Ended
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Oct. 28, 2017
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic pension benefit for the UK Plan are as follows:
| 13 weeks ended |  | 39 weeks ended
(in millions) | October 28, 2017 |  | October 29, 2016 |  | October 28, 2017 |  | October 29, 2016
Components of net periodic pension benefit: |  |  |  |  |  |  |
Service cost | $ | (0.6 | ) |  | $ | (0.5 | ) |  | $ | (1.6 | ) |  | $ | (1.5 | )
Interest cost | (1.6 | ) |  | (1.7 | ) |  | (4.7 | ) |  | (5.5 | )
Expected return on UK Plan assets | 2.4 |  |  | 2.5 |  |  | 7.1 |  |  | 8.0 |
Amortization of unrecognized actuarial losses | (0.7 | ) |  | (0.4 | ) |  | (2.2 | ) |  | (1.2 | )
Amortization of unrecognized net prior service credits | 0.4 |  |  | 0.5 |  |  | 1.3 |  |  | 1.5 |
Net periodic pension (expense) benefit | $ | (0.1 | ) |  | $ | 0.4 |  |  | $ | (0.1 | ) |  | $ | 1.3 |
Net curtailment gain and settlement loss | 3.7 |  |  | — |  |  | 3.7 |  |  | — |
Total recognized in net periodic pension benefit and OCI | $ | 3.6 |  |  | $ | 0.4 |  |  | $ | 3.6 |  |  | $ | 1.3 |

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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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