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Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Components of net periodic benefit cost: |  |  |  |
Service cost | $ 3.5 | $ 3.7 | $ 10.4 | $ 11.0
Interest cost | 8.1 | 9.2 | 24.1 | 28.2
Expected return on plan assets | (9.9) | (10.0) | (29.3) | (30.3)
Amortization of prior service credit | 0.4 | 0.5 | 1.1 | 1.3
Net periodic benefit cost | 2.1 | 3.4 | 10.7 | 10.2
Postretirement Benefit Plans [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | 0.0 | 0.1 | 0.1 | 0.3
Interest cost | 2.3 | 2.7 | 6.8 | 8.2
Expected return on plan assets | (1.4) | (1.6) | (4.2) | (4.9)
Amortization of prior service credit | (0.3) | 0.2 | (0.8) | 0.7
Net periodic benefit cost | 0.6 | 1.4 | 1.9 | 4.3
Pension Plan [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | 3.1 | 3.3 | 9.2 | 9.9
Interest cost | 6.2 | 6.6 | 18.5 | 20.0
Expected return on plan assets | (7.0) | (7.4) | (21.0) | (22.3)
Amortization of prior service credit | 0.3 | 0.4 | 1.0 | 1.2
Net periodic benefit cost | 2.6 | 2.9 | 12.1 | 8.8
Foreign Plan [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | 0.4 | 0.4 | 1.2 | 1.1
Interest cost | 1.9 | 2.6 | 5.6 | 8.2
Expected return on plan assets | (2.9) | (2.6) | (8.3) | (8.0)
Amortization of prior service credit | 0.1 | 0.1 | 0.1 | 0.1
Net periodic benefit cost | $ (0.5) | $ 0.5 | $ (1.4) | $ 1.4

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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