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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Effective income tax rate | 15.50% | 21.50% | 19.20% | 20.10%
Excess tax benefits (expense) |  | $ (1.9) |  | $ 5.4
Discrete tax expense (benefit) related to TCJA |  | 1.7 |  | (4.8)
Release of valuation allowances |  | 1.2 |  | 7.3
Foreign accrual to return adjustment |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Other tax (benefit) expense |  | $ (2.0) |  | (2.0)
Gain on sale of business |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Other tax (benefit) expense |  |  |  | 42.0
Tax accounting method change |  |  |  |
Other Tax Expense (Benefit) [Line Items] |  |  |  |
Other tax (benefit) expense |  |  |  | $ (8.0)

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