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Share-Based Compensation Textuals (Details)
$ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
years
shares
Apr. 01, 2017
shares
Share-Based Compensation Expense and Cash Flows (Line Items)        
Unrecognized compensation cost related to nonvested awards net of tax Total | $   $ 27.7    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 6 months  
Unrecognized compensation cost period for recognition, weighted-average, years | years     0.6  
Common Stock        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Number of Shares Authorized   8,900,000    
Effect of Plan | 2017 Incentive Plan        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Common stock reserved for future issuance       14,000,000
Deferred Stock Units        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Vesting period of performance units     3 years  
Restricted Stock Units (RSUs)        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Vesting period of performance units     3 years  
Total fair value of restricted stock units granted | $ $ 79.8 $ 19.8 $ 18.2  
Nonvested dividend equivalent units   1,706,025 2,641,087  
Total fair value of restricted stock units vested | $ $ 0.9 $ 40.3 $ 46.2  
Performance Units, Grants   664,899    
Dividend Equivalent Units        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Nonvested dividend equivalent units   176,000    
Performance Units        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Nonvested dividend equivalent units   426,606 206,630  
Performance Units, Grants 0 264,918    
Dividend Equivalent Units, Performance Shares [Domain]        
Share-Based Compensation Expense and Cash Flows (Line Items)        
Nonvested dividend equivalent units   44,000