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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unrecognized tax benefits [Roll Forward] |  |
Balance as of beginning of period | $ 103.8 | $ 84.5
Additions based on tax positions related to current period | 0.0 | 2.5
Additions for tax positions of prior years | 0.7 | 21.2
Expiration of statutes of limitations | 0.0 | 0.0
Settlements of uncertain tax positions with tax authorities | 0.0 | (4.4)
Balance as of end of period | $ 104.5 | $ 103.8

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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