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Income Taxes - Activity for Unrecognized Gross Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized Gross Tax Benefits |  |  |
Balance at beginning of year | $ 112.2 | $ 114.8 | $ 136.7
Acquired balances | 15.5 | 0.0 | 0.0
Additions for tax benefits related to the current year | 9.4 | 7.4 | 23.6
Additions for tax benefits of prior years | 8.0 | 2.8 | 4.7
Reductions for tax benefits of prior years | (0.2) | (1.9) | (1.6)
Lapse of statute | (8.2) | (10.9) | (16.3)
Settlements | (6.7) | 0.0 | (4.9)
Change in rate due to U.S. Tax Reform | 0.0 | 0.0 | (27.4)
Balance at end of year | $ 130.0 | $ 112.2 | $ 114.8

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- Definition Unrecognized Tax Benefits, Reduction Resulting From Change In Tax Rate + 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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