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BENEFIT PLANS: (Tables) | 6 Months Ended
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Jun. 30, 2019
Post retirement defined benefit plans and defined contribution plan |
Components of net periodic benefit costs |
Schedule of the components of net periodic benefit costs | The components of net periodic benefit costs for the six months ended June 30, 2019 and 2018 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2019 |  | 2018
Service cost | ​ | $ | 0.5 | ​ | $ | 0.5
Interest cost | ​ |  | 0.9 | ​ |  | 0.8
Expected return on plan assets | ​ |  | (1.7) | ​ |  | (1.8)
Amortization of prior service cost / (credit) | ​ |  | 0.1 | ​ |  | 0.1
Amortization of net loss/(gain) | ​ |  | 0.1 | ​ |  | 0.1
Net periodic benefit cost | ​ | $ | (0.1) | ​ | $ | (0.3)
Post-retirement Health care plans |
Components of net periodic benefit costs |
Schedule of the components of net periodic benefit costs | The components of net periodic benefit cost for the six months ended June 30, 2019 and 2018 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2019 |  | 2018
Interest cost | ​ | $ | 0.5 | ​ | $ | 0.5
Amortization of net loss (gain) | ​ |  | (0.1) | ​ |  | (0.1)
Amortization of prior service cost/ (credit) | ​ |  | (*) | ​ |  | (*)
Net periodic benefit cost | ​ | $ | 0.4 | ​ | $ | 0.4
(*) amount is lower than $0.1 million

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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 Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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