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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)