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Retirement Benefit Plans | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [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 2016 range from $15.0 million to $25.0 million, of which $10.4 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) |  | 2016 |  | 2015 |
Three Months Ended June 30, |  | US |  | Non-US |  | US |  | Non-US |  | 2016 |  | 2015
Service cost |  | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 3.7 |  |  | $ | — |  |  | $ | — |
Interest cost |  | 2.4 |  |  | 3.3 |  |  | 2.7 |  |  | 3.5 |  |  | 0.9 |  |  | 1.4 |
Expected return on plan assets |  | (3.8 | ) |  | (6.3 | ) |  | (4.3 | ) |  | (6.2 | ) |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | (0.2 | ) |  | — |  |  | (0.2 | ) |  | — |  |  | (1.2 | ) |  | (1.4 | )
Amortization of unrecognized loss |  | 1.3 |  |  | 1.5 |  |  | 1.7 |  |  | 1.7 |  |  | 0.6 |  |  | 0.8 |
Net periodic benefit (income) cost |  | $ | (0.3 | ) |  | $ | 2.7 |  |  | $ | (0.1 | ) |  | $ | 2.7 |  |  | $ | 0.3 |  |  | $ | 0.8 |
|  | Pension benefits |  | Other postretirement employee benefits
(in millions) |  | 2016 |  | 2015 |
Six Months Ended June 30, |  | US |  | Non-US |  | US |  | Non-US |  | 2016 |  | 2015
Service cost |  | $ | — |  |  | $ | 8.2 |  |  | $ | — |  |  | $ | 7.4 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 4.8 |  |  | 6.5 |  |  | 5.5 |  |  | 7.1 |  |  | 1.9 |  |  | 2.8 |
Expected return on plan assets |  | (7.5 | ) |  | (12.6 | ) |  | (8.6 | ) |  | (12.4 | ) |  | — |  |  | — |
Amortization of unrecognized prior service credit |  | (0.4 | ) |  | — |  |  | (0.4 | ) |  | — |  |  | (2.4 | ) |  | (2.8 | )
Amortization of unrecognized loss |  | 2.5 |  |  | 3.1 |  |  | 3.3 |  |  | 3.4 |  |  | 1.1 |  |  | 1.5 |
Net periodic benefit (income) cost |  | $ | (0.6 | ) |  | $ | 5.2 |  |  | $ | (0.2 | ) |  | $ | 5.5 |  |  | $ | 0.7 |  |  | $ | 1.6 |

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