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Retirement Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Retirement Benefit Plans | Retirement Benefit Plans The Company has a number of defined benefit pension plans and other postretirement benefit plans covering eligible salaried and hourly employees and their dependents. The estimated contributions to the Company's defined benefit pension plans for 2018 range from $15.0 million to $25.0 million, of which $8.1 million has been contributed through the first six months of the year. The other postretirement benefit plans, which provide medical and life insurance benefits, are unfunded plans. The components of net periodic benefit cost recorded in the Condensed Consolidated Statements of Operations are as follows:
|  | Pension benefits |  | Other postretirement employee benefits
(in millions) |  | 2018 |  | 2017 |
Three Months Ended June 30, |  | US |  | Non-US |  | US |  | Non-US |  | 2018 |  | 2017
Service cost |  | $ | — |  |  | $ | 4.5 |  |  | $ | — |  |  | $ | 4.5 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost |  | 2.2 |  |  | 3.0 |  |  | 2.2 |  |  | 2.6 |  |  | 0.7 |  |  | 0.8 |
Expected return on plan assets |  | (3.5 | ) |  | (6.9 | ) |  | (3.2 | ) |  | (5.8 | ) |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | (0.2 | ) |  | — |  |  | (0.2 | ) |  | — |  |  | (1.0 | ) |  | (1.0 | )
Amortization of unrecognized loss |  | 1.1 |  |  | 1.8 |  |  | 1.0 |  |  | 1.9 |  |  | 0.3 |  |  | 0.3 |
Net periodic benefit (income) cost |  | $ | (0.4 | ) |  | $ | 2.4 |  |  | $ | (0.2 | ) |  | $ | 3.2 |  |  | $ | — |  |  | $ | 0.2 |
|  | Pension benefits |  | Other postretirement employee benefits
(in millions) |  | 2018 |  | 2017 |
Six Months Ended June 30, |  | US |  | Non-US |  | US |  | Non-US |  | 2018 |  | 2017
Service cost |  | $ | — |  |  | $ | 9.1 |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost |  | 4.3 |  |  | 6.1 |  |  | 4.4 |  |  | 5.2 |  |  | 1.4 |  |  | 1.6 |
Expected return on plan assets |  | (6.9 | ) |  | (13.9 | ) |  | (6.5 | ) |  | (11.4 | ) |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | (0.4 | ) |  | — |  |  | (0.4 | ) |  | — |  |  | (2.0 | ) |  | (2.0 | )
Amortization of unrecognized loss |  | 2.1 |  |  | 3.6 |  |  | 2.1 |  |  | 3.8 |  |  | 0.6 |  |  | 0.6 |
Net periodic benefit (income) cost |  | $ | (0.9 | ) |  | $ | 4.9 |  |  | $ | (0.4 | ) |  | $ | 6.4 |  |  | $ | — |  |  | $ | 0.3 |
The components of net periodic benefit cost other than the service cost component are included in Other postretirement income in the Condensed Consolidated Statements of Operations.

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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Period Type: | duration