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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses $ 0.5 $ (0.4) $ (1.8) $ (0.8)
Tax benefit (4.2) (1.0) (2.0) (5.3)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net loss (0.3) (0.2) (0.9) (0.6)
Reclassification out of Accumulated Other Comprehensive Income | Selling, general and administrative        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses (0.4) (0.3) (1.2) (0.8)
Reclassification out of Accumulated Other Comprehensive Income | Income tax benefit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit $ (0.1) $ (0.1) $ 0.3 $ (0.2)