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Retirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs |
|  | Pension benefits |  | Other postretirement employee benefits
(in millions) |  | 2018 |  | 2017 |
Three Months Ended September 30, |  | US |  | Non-US |  | US |  | Non-US |  | 2018 |  | 2017
Service cost |  | $ | — |  |  | $ | 4.4 |  |  | $ | — |  |  | $ | 4.5 |  |  | $ | 0.1 |  |  | $ | — |
Interest cost |  | 2.1 |  |  | 3.0 |  |  | 2.2 |  |  | 2.8 |  |  | 0.7 |  |  | 0.8 |
Expected return on plan assets |  | (3.4 | ) |  | (6.7 | ) |  | (3.3 | ) |  | (6.0 | ) |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | (0.2 | ) |  | — |  |  | (0.2 | ) |  | — |  |  | (1.1 | ) |  | (1.1 | )
Amortization of unrecognized loss |  | 1.0 |  |  | 1.7 |  |  | 1.1 |  |  | 2.0 |  |  | 0.3 |  |  | 0.4 |
Net periodic benefit (income) cost |  | $ | (0.5 | ) |  | $ | 2.4 |  |  | $ | (0.2 | ) |  | $ | 3.3 |  |  | $ | — |  |  | $ | 0.1 |
|  | Pension benefits |  | Other postretirement employee benefits
(in millions) |  | 2018 |  | 2017 |
Nine Months Ended September 30, |  | US |  | Non-US |  | US |  | Non-US |  | 2018 |  | 2017
Service cost |  | $ | — |  |  | $ | 13.5 |  |  | $ | — |  |  | $ | 13.3 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 6.4 |  |  | 9.1 |  |  | 6.6 |  |  | 8.0 |  |  | 2.1 |  |  | 2.4 |
Expected return on plan assets |  | (10.3 | ) |  | (20.6 | ) |  | (9.8 | ) |  | (17.4 | ) |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | (0.6 | ) |  | — |  |  | (0.6 | ) |  | — |  |  | (3.1 | ) |  | (3.1 | )
Amortization of unrecognized loss |  | 3.1 |  |  | 5.3 |  |  | 3.2 |  |  | 5.8 |  |  | 0.9 |  |  | 1.0 |
Net periodic benefit (income) cost |  | $ | (1.4 | ) |  | $ | 7.3 |  |  | $ | (0.6 | ) |  | $ | 9.7 |  |  | $ | — |  |  | $ | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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