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Retirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actual contribution to defined benefit pension plans |  |  | $ 8.1 |  |
Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year |  |  |  |  | $ 15.0
Scenario, Forecast [Member] | Maximum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year |  |  |  |  | $ 25.0
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | $ 0.0 | $ 0.1 | 0.0 | $ 0.1 |
Interest cost | 0.7 | 0.8 | 1.4 | 1.6 |
Expected return on plan assets | 0.0 | 0.0 | 0.0 | 0.0 |
Amortization of unrecognized prior service credit | (1.0) | (1.0) | (2.0) | (2.0) |
Amortization of unrecognized loss | 0.3 | 0.3 | 0.6 | 0.6 |
Net periodic benefit (income) cost | 0.0 | 0.2 | 0.0 | 0.3 |
Pension Plan [Member] | UNITED STATES |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0 |
Interest cost | 2.2 | 2.2 | 4.3 | 4.4 |
Expected return on plan assets | (3.5) | (3.2) | (6.9) | (6.5) |
Amortization of unrecognized prior service credit | (0.2) | (0.2) | (0.4) | (0.4) |
Amortization of unrecognized loss | 1.1 | 1.0 | 2.1 | 2.1 |
Net periodic benefit (income) cost | (0.4) | (0.2) | (0.9) | (0.4) |
Pension Plan [Member] | Non-US [Member] |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | 4.5 | 4.5 | 9.1 | 8.8 |
Interest cost | 3.0 | 2.6 | 6.1 | 5.2 |
Expected return on plan assets | (6.9) | (5.8) | (13.9) | (11.4) |
Amortization of unrecognized prior service credit | 0.0 | 0.0 | 0.0 | 0.0 |
Amortization of unrecognized loss | 1.8 | 1.9 | 3.6 | 3.8 |
Net periodic benefit (income) cost | $ 2.4 | $ 3.2 | $ 4.9 | $ 6.4 |

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- Definition Amount of gain (loss) 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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