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Retirement Benefits (Details 1) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Cost | $ 44.8 | $ 39.9 | $ 35.5
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan curtailments | 0.0 | 0.4 |
Service cost - benefits earned during the year | 12.7 | 16.4 | 14.1
Interest cost on benefits earned in prior years | 105.5 | 104.8 | 116.7
Expected return on plan assets | (131.3) | (157.9) | (146.9)
Amortization of prior service cost (credit) | 0.3 | 0.3 | 1.3
Amortization of net actuarial loss | 73.7 | 65.9 | 62.6
Curtailment loss | 0.0 | 0.4 | 0.0
Total retirement benefit expense | 60.9 | 29.9 | 47.8
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan curtailments | 0.0 | 0.0 |
Defined Contribution Plan, Cost | 1.0 | 1.0 | 1.7
Service cost - benefits earned during the year | 1.9 | 2.5 | 2.4
Interest cost on benefits earned in prior years | 14.8 | 12.7 | 14.6
Expected return on plan assets | 0.0 | 0.0 | 0.0
Amortization of prior service cost (credit) | (2.9) | (2.9) | (2.9)
Amortization of net actuarial loss | 13.5 | 10.6 | 9.0
Curtailment loss | 0.0 | 0.0 | 0.0
Total retirement benefit expense | $ 27.3 | $ 22.9 | $ 23.1

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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