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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gross Unrecognized Income Tax Benefits |  |  |
Gross unrecognized income tax benefits, Beginning Balance | $ 0.9 | $ 0.3 |
Gross amount of decreases in unrecognized tax benefits related to prior periods |  |  | $ (0.4)
Decreases in unrecognized tax benefits relating to settlements with taxing authorities |  |  | (2.1)
Gross amount of increases in unrecognized tax benefits related to prior periods |  | 0.8 |
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations | (0.5) | (0.2) |
Gross unrecognized income tax benefits, Ending Balance | 0.4 | 0.9 | $ 0.3
Accrued Interest and Penalties |  |  |
Unrecognized Tax Benefits, Accrued interest and penalties, Beginning Balance | 0.1 |  |
Gross amount of increases in unrecognized tax benefits related to prior periods |  | 0.1 |
Unrecognized Tax Benefits, Accrued interest and penalties, Ending Balance | $ 0.1 | $ 0.1 |

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- Definition Accrued interest and penalties associated with the gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + 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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- 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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- Definition Amount of increase 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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