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BENEFIT PLANS: (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 USD ($) plan | Jun. 30, 2017 USD ($)
Benefit plans |  |
Number of noncontributory defined benefit pension plans | plan | 2 |
Post retirement defined benefit plans |  |
Defined benefit plan, net periodic benefit costs |  |
Service cost | $ 0.5 | $ 0.4
Interest cost | 0.8 | 0.7
Expected return on plan assets | (1.8) | (1.4)
Amortization of prior service cost (credit) | 0.1 | 0.1
Amortization of net loss (gain) | 0.1 | 0.1
Net periodic benefit cost | (0.3) | (0.1)
Post retirement defined benefit plans | Maximum |  |
Defined benefit plan, net periodic benefit costs |  |
Amortization of prior service cost (credit) | 0.1 | 0.1
Amortization of net loss (gain) | 0.1 | 0.1
Post-retirement health care plans |  |
Defined benefit plan, net periodic benefit costs |  |
Interest cost | 0.5 | 0.5
Amortization of net loss (gain) | (0.1) | (0.1)
Net periodic benefit cost | 0.4 | 0.4
Post-retirement health care plans | Maximum |  |
Defined benefit plan, net periodic benefit costs |  |
Amortization of prior service cost (credit) | $ 0.1 | $ 0.1

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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)(2) -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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -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 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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