Derivative Instruments And Hedging Activities Volumes related to price risk purchase derivatives (Details)	9 Months Ended
	Sep. 30, 2020 USD ($) bbl XPT ( )
Platinum, Ounces
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative forward contract - platinum |	40,867
Platinum, Ounces | Maturing in Year Two [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative forward contract - platinum |	40,867
Not Designated as Hedging Instrument [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Foreign currency forward contracts | $	$ 419,278,042
Not Designated as Hedging Instrument [Member] | Maturing in Next Twelve Months [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Foreign currency forward contracts | $	106,910,645
Not Designated as Hedging Instrument [Member] | Maturing in Year Two [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Foreign currency forward contracts | $	$ 312,367,397
Not Designated as Hedging Instrument [Member] | Platinum, Ounces | Maturing in Next Twelve Months [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Derivative forward contract - platinum |	0
Not Designated as Hedging Instrument [Member] | NYMEX WTI Short
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net | bbl	1,045,000
Not Designated as Hedging Instrument [Member] | NYMEX WTI Short | Maturing in Next Twelve Months [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net | bbl	830,000
Not Designated as Hedging Instrument [Member] | NYMEX WTI Short | Maturing in Year Two [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net | bbl	215,000