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Changes In Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Net operating loss tax carryovers | $ 264.4 | $ 307.5
Tax credits | 42.6 | 49.7
Gross deferred income tax assets | 632.4 | 673.6
Valuation allowance | (94.5) | (194.8)
Total deferred income tax assets | $ 537.9 | $ 478.8

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