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Related Party (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Revenue from Related Parties		$ 842.4	$ 715.3	$ 623.1
Related Parties Amount in Cost of Sales		1,046.4	750.2	$ 552.9
Other Assets, Miscellaneous		30.7	0.0
Due to Affiliate		95.2	45.4
Ma'aden Wa'ad Al Shamal Phosphate Company [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		$ 6.6	1.0
Ma'aden Wa'ad Al Shamal Phosphate Company [Member]
Related Party Transaction [Line Items]
Percentage Of Total Production Expected To Market	25.00%	25.00%
Equity Method Investment, Ownership Percentage	25.00%
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Guarantor Obligations, Number Of Vessels To Be Constructed				2
Notes Payable, Related Parties		$ 75.3	$ 73.2
Increase (Decrease) in Notes Payable, Related Parties		$ 54.2
Equity Method Investee Gulf Sulphur Services [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage		50.00%		50.00%

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