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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized Tax Benefits |  |  |  |  |
Unrecognized tax benefits | $ 21.8 | $ 27.4 | $ 10.8 | $ 33.8 | $ 21.8
Unrecognized tax benefit, if recognized, would have an impact on effective tax rate |  |  |  | 33.8 |
Decrease in unrecognized tax benefits is reasonably possible |  |  |  | 4.3 |
Payment of interest and penalties accrued |  |  |  | $ 1.7 | $ 1.3
Activity for unrecognized tax benefits [Roll Forward] |  |  |  |  |
Balance at beginning of period | 21.8 | 27.4 | 10.8 |  |
Tax positions related to current year additions | 10.8 | 2.3 | 8.4 |  |
Additions for tax positions of prior years | 2.6 | 0.0 | 9.7 |  |
Tax positions related to prior years reductions | (0.2) | (7.3) | (0.3) |  |
Reductions due to lapse of statute of limitations on tax positions | (1.2) | 0.0 | (0.4) |  |
Settlements | 0.0 | (0.6) | (0.8) |  |
Balance at end of period | $ 33.8 | $ 21.8 | $ 27.4 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + 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=84176650&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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