Derivative Instruments And Hedging Activities Volumes related to price risk purchase derivatives (Details)	3 Months Ended
	Mar. 31, 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 | $	$ 426,037,417
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 | $	319,732,567
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 | $	$ 106,304,850
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	455,000
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	455,000
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