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Debt - Long-term (Details) - USD ($)		9 Months Ended
	Sep. 28, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt issuance cost		$ (10,700,000)	$ (13,200,000)
Total long-term debt		2,676,900,000	3,094,200,000
Less: debt maturing within one year		83,600,000	101,200,000
Total long-term debt, less current portion		2,593,300,000	2,993,000,000
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively)
Debt Instrument [Line Items]
Long-term debt, gross		$ 51,600,000	51,600,000
Maturity date, minimum		2021
Maturity date, maximum		2032
Unamortized discounts		$ 200,000	200,000
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively) | Minimum
Debt Instrument [Line Items]
Interest Rate Percentage		1.80%
Pollution control and industrial revenue bonds (less unamortized discounts of $0.2 and $0.2, respectively) | Maximum
Debt Instrument [Line Items]
Interest Rate Percentage		6.50%
Senior notes (less unamortized discount of $0.9 and $1.1, respectively)
Debt Instrument [Line Items]
Long-term debt, gross		$ 999,100,000	998,900,000
Maturity date, minimum		2019
Maturity date, maximum		2024
Unamortized discounts		$ 900,000	1,100,000
Senior notes (less unamortized discount of $0.9 and $1.1, respectively) | Minimum
Debt Instrument [Line Items]
Interest Rate Percentage		3.95%
Senior notes (less unamortized discount of $0.9 and $1.1, respectively) | Maximum
Debt Instrument [Line Items]
Interest Rate Percentage		5.20%
2014 Term Loan Facility
Debt Instrument [Line Items]
Interest Rate Percentage		3.50%
Maturity Date		2020
Long-term debt, gross		$ 150,000,000	450,000,000
2017 Term Loan Facility
Debt Instrument [Line Items]
Interest Rate Percentage		3.50%
Maturity Date		2022
Long-term debt, gross		$ 1,400,000,000	1,500,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate Percentage		4.80%
Maturity Date		2022
Long-term debt, gross		$ 0	0
Letters of credit outstanding amount		201,700,000
Credit Agreement, available funds		$ 1,298,300,000
FMC Lithium Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate Percentage		4.90%
Maturity Date		2023
Long-term debt, gross		$ 0	0
Foreign debt
Debt Instrument [Line Items]
Long-term debt, gross		$ 86,900,000	$ 106,900,000
Maturity date, minimum		2018
Maturity date, maximum		2024
Foreign debt | Minimum
Debt Instrument [Line Items]
Interest Rate Percentage		0.00%
Foreign debt | Maximum
Debt Instrument [Line Items]
Interest Rate Percentage		7.20%
Revolving Credit Facility | FMC Lithium Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding amount		$ 0
Revolving Credit Facility | Citibank, N.A. | FMC Lithium Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000
Increase in borrowing capacity	600,000,000
Letter of Credit | Citibank, N.A. | FMC Lithium Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000
Federal Funds Effective Rate | Revolving Credit Facility | Citibank, N.A. | FMC Lithium Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Eurodollar Rate | Revolving Credit Facility | Citibank, N.A. | FMC Lithium Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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