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Retirement Benefits (Details1) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Pension Plans Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the year | $ 3.2 | $ 3.2
Interest cost on benefits earned in prior years | 21.5 | 26.3
Expected return on plan assets | (33.6) | (32.8)
Amortization of prior service cost (credit) | 0.2 | 0.1
Amortization of net actuarial loss | 18.6 | 18.4
Total retirement benefit expense | 9.9 | 15.2
Other Postretirement Benefit Plan, Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the year | 0.5 | 0.5
Interest cost on benefits earned in prior years | 2.7 | 3.7
Expected return on plan assets | 0.0 | 0.0
Amortization of prior service cost (credit) | (0.9) | (0.7)
Amortization of net actuarial loss | 2.7 | 3.3
Total retirement benefit expense | $ 5.0 | $ 6.8

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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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- 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/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)(3) -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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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