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Pensions (Tables) | 6 Months Ended
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Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Summary of Components of Net Postretirement Pensions Expense | The following table summarizes the components of net postretirement pension expense:
| U.S. Benefit Plan |  | Non-U.S. Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30, |  | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | — |  |  | $ | — |  |  | — |  |  | — |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost | 1.9 |  |  | 1.9 |  |  | 3.8 |  |  | 3.9 |  |  | 0.5 |  |  | 0.6 |  |  | 1.0 |  |  | 1.3 |
Amortization of actuarial loss | 1.8 |  |  | 1.3 |  |  | 3.4 |  |  | 2.5 |  |  | 0.2 |  |  | 0.1 |  |  | 0.4 |  |  | 0.2 |
Expected return on plan assets | (2.6 | ) |  | (2.2 | ) |  | (5.1 | ) |  | (4.5 | ) |  | (0.7 | ) |  | (0.9 | ) |  | (1.4 | ) |  | (1.8 | )
Net postretirement pension expense | $ | 1.1 |  |  | $ | 1.0 |  |  | 2.1 |  |  | 1.9 |  |  | $ | 0.1 |  |  | $ | (0.1 | ) |  | $ | 0.2 |  |  | $ | (0.1 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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