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Commitments and Contingencies (Pace, Piedmont, Pasadena - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Sep. 30, 2012
Sep. 30, 2008
Sep. 30, 2006
Mar. 31, 2022
Pace, Florida          
Loss Contingencies [Line Items]          
Accrual for environmental loss contingencies       $ 42.0 $ 38.7
Change in estimated exposure $ 19.0        
Pace, Florida | Discontinued operations          
Loss Contingencies [Line Items]          
Pretax environmental expense $ 19.0     $ 42.0  
Piedmont, South Carolina          
Loss Contingencies [Line Items]          
Accrual for environmental loss contingencies     $ 24.0   8.9
Piedmont, South Carolina | Discontinued operations          
Loss Contingencies [Line Items]          
Pretax environmental expense     $ 24.0    
Pasadena, Texas          
Loss Contingencies [Line Items]          
Accrual for environmental loss contingencies         $ 11.0
Total anticipated exposure   $ 13.0