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Debt (Senior Notes) (Details) - Senior notes - USD ($)
$ in Millions
Mar. 29, 2017
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
2017 FMC Notes        
Debt Instrument [Line Items]        
Interest rate, stated percentage     2.00% 2.00%
3.45% Senior Notes due 2022        
Debt Instrument [Line Items]        
Interest rate, stated percentage   3.45% 3.45% 3.45%
Debt instrument, redemption price, percentage 100.00%      
Long-term Debt, Gross   $ 500.0   $ 500.0