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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Income tax (provision) benefit | $ (92.6) | $ (5.8) | $ (103.4) | $ (6.6)
Effective income tax rate | (28.30%) | 6.90% | (35.30%) | 6.50%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ 99.0 |  |  |

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