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Income Taxes Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Unrecognized Tax Benefits Recorded in Balance Sheet [Line Items] |  |  |  |  |
Deferred income taxes | $ 15.5 | $ 13.0 |  |  |
Other noncurrent liabilities | 1.0 | 1.0 |  |  |
Net unrecognized tax benefits | 16.5 | 14.0 |  |  |
Gross unrecognized tax benefits | $ 16.5 | $ 14.0 | $ 12.7 | $ 12.5 | $ 20.1

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