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Pensions and Other Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Components of net annual benefit cost (income) | The following table summarizes the components of net annual benefit cost (income):
(in Millions) | Three Months Ended March 31,
Pensions |  | Other Benefits
2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 1.7 |  |  | $ | 2.1 |  |  | $ | — |  |  | $ | — |
Interest cost | 11.4 |  |  | 11.4 |  |  | 0.1 |  |  | 0.2 |
Expected return on plan assets | (15.8 | ) |  | (19.9 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | 0.1 |  |  | 0.2 |  |  | — |  |  | — |
Recognized net actuarial and other (gain) loss | 4.1 |  |  | 4.0 |  |  | (0.2 | ) |  | (0.3 | )
Recognized loss due to settlement (1) | 0.9 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | 2.4 |  |  | $ | (2.2 | ) |  | $ | (0.1 | ) |  | $ | (0.1 | )

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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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