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Uncrecognized Tax Benefits and Tax Reform (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at January 1 | $ 4.3 | $ 6.4 | $ 5.8
Additions based on tax positions related to the current year | 0.0 | 0.0 | 0.0
Additions for tax positions of prior years | 1.4 | 0.6 | 0.8
Reductions for tax positions of prior years | 0.0 | 0.0 | 0.0
Reductions for expirations of statute of limitations | (0.4) | (0.9) | (0.2)
Settlements | 0.0 | (1.8) | 0.0
Balance at December 31 | 5.3 | 4.3 | 6.4
Unrecognized tax benefits, accumulated interest and penalties | 7.5 | 6.6 | 6.8
Deferred tax assets related to unrecognized tax benefits | 2.8 | 2.4 | 2.8
Net unrecognized tax benefits, associated interest, penalties and deferred tax asset that if resolved would impact effective tax rate | 10.0 | 8.5 | 10.4
Recognized interest and penalties | $ 0.7 | $ 0.6 | $ 0.4
Income tax provision at statutory rate, % | 21.00% | 21.00% | 35.00%
Adjustment to provisional estimate for enactment of new tax legislation, amount |  | $ 5.0 | $ 41.3
Adjustment to provisional estimate for enactment of new tax legislation, impact to effective tax rate |  | 0.90% |

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