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Income Taxes Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Line Items] |  |  |  |
Balance at beginning of period | $ 20.1 | $ 12.5 | $ 14.0 | $ 12.7
Additions for current year tax positions | 0.0 | 0.8 | 2.2 | 1.8
Additions (reductions) for prior year tax positions | 7.6 | 0.5 | 0.3 | 0.0
Reductions for settlements with tax authorities | 0.0 | (0.1) | 0.0 | (0.5)
Balance at end of period | $ 12.5 | $ 12.7 | $ 16.5 | $ 14.0

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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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