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INCOME TAXES: - TCJA (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2009
Income Taxes |  |  |  |
Percentage of ownership by parent | 88.90% |  |  |
U.S. statutory rate (as a percent) | 21.00% | 21.00% | 35.00% |
Non-cash tax expense for estimated tax effect of the TCJA |  |  | $ 785.9 |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Existing Income Tax Expense (Benefit) |  | $ 816.8 |  |
Amount determined for final impact of the TCJA |  | 816.8 |  |
Amount of change in income tax expense (benefit) from provisional amount |  | $ 30.9 |  |
Maximum percentage of expenses excluding cost of goods sold | 3.00% |  |  |
Minimum |  |  |  |
Income Taxes |  |  |  |
BEAT tax rate (as a percent) |  | 5.00% |  |
Minimum | Years 2019 through 2025 |  |  |  |
Income Taxes |  |  |  |
BEAT tax rate (as a percent) | 10.00% |  |  |
Minimum | Years thereafter |  |  |  |
Income Taxes |  |  |  |
BEAT tax rate (as a percent) | 12.50% |  |  |
AMC | Minimum |  |  |  |
Income Taxes |  |  |  |
Percentage of ownership by parent |  |  |  | 80.00%

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