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Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Schedule Of Defined Benefit Plans Disclosures [Table Text Block] | For the three month periods ended March 31, 2018 and 2017, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions):
| Pension Benefits |  | Other Postretirement Benefits
| Three months ended March 31, |  | Three months ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost - benefits earned during the year | $ | 4.2 |  |  | $ | 3.5 |  |  | $ | 0.6 |  |  | $ | 0.6 |
Interest cost on benefits earned in prior years | 26.1 |  |  | 29.2 |  |  | 3.1 |  |  | 3.7 |
Expected return on plan assets | (39.5 | ) |  | (36.7 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | 0.1 |  |  | 0.3 |  |  | (0.7 | ) |  | (0.7 | )
Amortization of net actuarial loss | 16.5 |  |  | 15.6 |  |  | 2.7 |  |  | 2.2 |
Total retirement benefit expense | $ | 7.4 |  |  | $ | 11.9 |  |  | $ | 5.7 |  |  | $ | 5.8 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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