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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 | Dec. 31, 2017
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |
Balance at the beginning of the year | $ 2.4 | $ 4.1 | $ 5.2
Increases in tax positions for prior years | 0.8 | 0.4 |
Decreases in tax positions for prior years |  |  | (0.1)
Settlements | (0.7) |  | (0.2)
Lapse of statute of limitations | (0.3) | (2.1) | (0.8)
Balance at the end of the year | 2.2 | 2.4 | $ 4.1
Unrecognized tax benefits, if recognized, would affect the effective tax rate | 2.2 |  |
Accrued interest and penalties on uncertain tax positions | $ 0.5 | $ 0.5 |

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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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