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INCOME TAXES: - Carryforward (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Foreign tax credits
Other U.S. tax credits	$ 0.0
Foreign
Foreign tax credits
Tax credits carryback period	1 year
Tax credits carryforward period	10 years
Foreign tax credit carryforward	$ 577.1
Foreign tax credit carryforward net of unrecognized tax benefit	281.9
2019 | Foreign
Foreign tax credits
Foreign tax credit carryforward	9.9
2020 | Foreign
Foreign tax credits
Foreign tax credit carryforward	10.5
2021 | Foreign
Foreign tax credits
Foreign tax credit carryforward	11.7
2022 | Foreign
Foreign tax credits
Foreign tax credit carryforward	84.1
2023 | Foreign
Foreign tax credits
Foreign tax credit carryforward	69.2
Foreign tax credit carryforward net of unrecognized tax benefit	11.3
2024 | Foreign
Foreign tax credits
Foreign tax credit carryforward	99.7
Foreign tax credit carryforward net of unrecognized tax benefit	36.3
2025 | Foreign
Foreign tax credits
Foreign tax credit carryforward	189.5
Foreign tax credit carryforward net of unrecognized tax benefit	141.5
2026 | Foreign
Foreign tax credits
Foreign tax credit carryforward	102.5
Foreign tax credit carryforward net of unrecognized tax benefit	$ 92.8

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- Definition

The amount of tax credit carryforward, before tax effect net of unrecognized tax benefit.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Carryforwards
-URI http://asc.fasb.org/extlink&oid=6506874

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