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Accumulated Other Comprehensive Loss (Reclassifications) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of amounts accumulated for interest rate swaps de-designated as cash flow hedges, net of tax |  |  | $ (1.3) | $ 0.0
Interest expense | $ 17.9 | $ 22.0 | 52.2 | 69.6
Income tax benefit | (12.0) | $ (17.6) | (17.5) | (28.0)
Interest Rate Swap Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of amounts accumulated for interest rate swaps de-designated as cash flow hedges, net of tax |  |  | (1.3) | $ 0.0
Interest Rate Swap Adjustments | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of amounts accumulated for interest rate swaps de-designated as cash flow hedges, net of tax | (1.3) |  | (1.3) |
Interest expense | 1.8 |  | 1.8 |
Income tax benefit | $ (0.5) |  | $ (0.5) |

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