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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Effective income tax rate | 18.20% | 21.50% | 21.20% | 19.70%
Release of valuation allowances |  | $ 8.5 |  | $ 8.5
Gain on sale of business |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Other tax expense (benefit) |  | 42.0 |  | 42.0
Tax accounting method change |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Other tax expense (benefit) |  | $ 8.0 |  | $ 8.0

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