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Related Party (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016
Related Party Transaction [Line Items]
Net amount due from our non-consolidated companies	$ 55.9
Net amount due to our non-consolidated companies		$ 23.2
Indemnification asset	23.0	40.6
Investee
Related Party Transaction [Line Items]
Indemnification asset	23.0
Transactions with non-consolidated companies included in net sales	819.6	969.5	$ 842.4
Transactions with non-consolidated companies included in cost of goods sold	950.1	1,057.7	1,046.4
Beneficial Owner
Related Party Transaction [Line Items]
Allowance against bridge loans to affiliates		74.7	54.2
MWSPC | Equity Method Investee
Related Party Transaction [Line Items]
Transactions with non-consolidated companies included in net sales	$ 8.5	$ 8.3	$ 6.6
Percentage Of Total Production Expected To Market	25.00%
Equity method investment, ownership percentage	25.00%
Gulf Sulphur Services
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	50.00%
Gulf Sulphur Services | Beneficial Owner
Related Party Transaction [Line Items]
Guarantor Obligations, Number Of Vessels To Be Constructed				2
Equity method investment, ownership percentage	50.00%
Bridge loans to affiliates	$ 74.7
Allowance against bridge loans to affiliates	$ 54.2

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Number of vessels to be constructed and used to transport anhydrous ammonia for the Company's operations.

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