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Pension Benefits and Postretirement Benefits Other Than Pensions (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) employees | Jun. 30, 2017 USD ($)
Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Pension Plan, Number of Participants and Beneficiaries | employees |  |  | 9,000 |
Defined Benefit Pension Plans, Number of Active Employees | employees |  |  | 1,600 |
Service Cost | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Interest Cost on Projected Benefit Obligation | 5.1 | 5.2 | 10.2 | 10.3
Expected Return on Plan Assets | (7.2) | (7.8) | (14.4) | (15.5)
Amortization of Accumulated Net Unrecognized Pension Costs | 1.1 | 0.7 | 2.1 | 1.3
Total Expense (Benefit) Recognized | (1.0) | (1.9) | $ (2.1) | (3.9)
Postretirement Benefits Other than Pensions [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other Postretirement Benefit Plan, Number of Retired Employees Covered | employees |  |  | 475 |
Other Postretirement Benefit Plan, Number of Active Employees Covered | employees |  |  | 200 |
Service Cost | 0.1 | 0.1 | $ 0.1 | 0.1
Interest Cost on Projected Benefit Obligation | 0.1 | 0.1 | 0.2 | 0.2
Amortization of Prior Service Credit | (0.6) | (0.4) | (0.9) | (0.7)
Amortization of Accumulated Net Unrecognized Pension Costs | (0.3) | (0.5) | (0.7) | (0.9)
Total Expense (Benefit) Recognized | $ (0.7) | $ (0.7) | $ (1.3) | $ (1.3)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: 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=112275985&loc=d3e4179-114921 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)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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