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Amount of unrecognized tax benefits.

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INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Foreign tax credits
Other U.S. tax credits	$ 0.0
Unrecognized Tax Benefits	$ 214.5	$ 214.5	$ 304.0	$ 400.0
Income Tax Rate (as a percent)	21.00%	35.00%	35.00%
Mexico
Foreign tax credits
Unrecognized Tax Benefits	$ 0.0
Income Tax Rate (as a percent)	30.00%	30.00%	30.00%
Peru
Foreign tax credits
Unrecognized Tax Benefits	$ 0.0
Income Tax Rate (as a percent)	29.50%	29.50%	28.00%
Foreign
Foreign tax credits
Tax credits carryback period	1 year
Tax credits carryforward period	10 years
Increase in foreign tax credits	$ 15.9
Unrecognized Tax Benefits	205.7
Foreign tax credit carryforward	689.1
Foreign tax credit carryforward net of unrecognized tax benefit	483.4
2022 \| Foreign
Foreign tax credits
Foreign tax credit carryforward	51.5
2023 \| Foreign
Foreign tax credits
Foreign tax credit carryforward	69.2
2024 \| Foreign
Foreign tax credits
Foreign tax credit carryforward	102.0
2025 \| Foreign
Foreign tax credits
Foreign tax credit carryforward	189.5
2026 \| Foreign
Foreign tax credits
Foreign tax credit carryforward	104.8
2028 \| Foreign
Foreign tax credits
Foreign tax credit carryforward	$ 172.1