Derivative Instruments And Hedging Activities Volumes related to price risk purchase derivatives (Details)	6 Months Ended
	Jun. 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 Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $	$ 422,074,120
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 Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $	214,491,576
Not Designated as Hedging Instrument [Member] | Maturing in Year Two [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $	$ 207,582,544
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 [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Price Risk Fair Value Hedge Derivative, at Fair Value, Net | bbl	890,000
Not Designated as Hedging Instrument [Member] | NYMEX WTI Short [Member] | 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	890,000
Not Designated as Hedging Instrument [Member] | NYMEX WTI Short [Member] | 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	0