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Accumulated Other Comprehensive Loss Reclassification Adjustments From AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Recognition of accumulated currency translation loss upon sale of equity method investment in VISA SunCoke $ 0.0 $ 0.0 $ (9.0)
Benefit Plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total, net of tax (0.1) 0.0 (8.9)
Actuarial loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amortization of benefit plans to net income (0.6) (0.6) (0.6)
Prior service benefit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amortization of benefit plans to net income $ 0.5 $ 0.6 $ 0.7