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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |
Income tax (expense) benefit | $ (64.6) | $ (56.8) | $ (103.3) | $ (95.5)
Effective income tax rate reconciliation, percent | 24.70% | 24.70% | 22.80% | 24.10%

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