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Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash paid (received) during the period for:
Interest	$ 196.0	$ 178.9	$ 163.0
Less amount capitalized	22.1	23.9	38.5
Cash interest, net	173.9	155.0	124.5
Income taxes	(34.2)	(70.1)	(65.4)
Increase (decrease) in capital expenditures incurred but not yet paid	(96.8)	11.1	43.7
Dividends Payable	11.8	12.1	96.3
Capital Leases, Assets Purchased		267.9
Depreciation	878.2	659.4	703.8
Amortization of Intangible Assets	$ 5.7	$ 6.1	$ 7.4
Equity Method Investee Gulf Sulphur Services [Member]
Cash paid (received) during the period for:
Equity Method Investment, Ownership Percentage	50.00%		50.00%

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