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Derivatives and Fair Value Measurements - Derivatives by Balance Sheet Classification (Details) $ in Millions | Dec. 31, 2021 AUD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | ---
Designated as Hedging Instrument |  |  |
Asset Derivative |  |  |
Asset derivatives, gross |  | $ 64.3 | $ 27.4
Effect of counterparty netting, derivative assets |  | (59.5) | (16.2)
Variation margin (held) posted on derivative assets |  | (3.4) | (0.3)
Net derivative assets and margin as classified in the balance sheets |  | 1.4 | 10.9
Liability Derivative |  |  |
Liability derivatives, gross |  | (184.2) | (24.7)
Effect of counterparty netting, derivative liabilities |  | 59.5 | 16.2
Variation margin (held) posted on derivative liabilities |  | 95.2 | 6.8
Net derivative liabilities and margin as classified in the balance sheets |  | (29.5) | (1.7)
Foreign currency option contracts |  |  |
Liability Derivative |  |  |
Derivative, Notional Amount | $ 535,000,000 |  |
Foreign currency option contracts | Designated as Hedging Instrument |  |  |
Asset Derivative |  |  |
Asset derivatives, gross |  | 1.4 | 10.3
Liability Derivative |  |  |
Liability derivatives, gross |  | 0.0 | 0.0
Derivative contracts related to forecasted sales | Designated as Hedging Instrument |  |  |
Asset Derivative |  |  |
Asset derivatives, gross |  | 59.5 | 16.7
Liability Derivative |  |  |
Liability derivatives, gross |  | (184.2) | (24.7)
Financial trading contracts | Designated as Hedging Instrument |  |  |
Asset Derivative |  |  |
Asset derivatives, gross |  | 3.4 | 0.4
Liability Derivative |  |  |
Liability derivatives, gross |  | $ 0.0 | $ 0.0

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