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Income Taxes - Classification of Net Deferred Income Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Long-term deferred income tax assets | $ 670.2 | $ 563.8
Long-term deferred income tax liabilities | (84.8) | (86.6)
Net deferred income tax asset | $ 585.4 | $ 477.2

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