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Lease Commitments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]        
Right-of-use assets obtained in exchange for new operating leases after adoption of ASC 842   $ 26.1    
Weighted average remaining lease term - operating leases 8 years 8 years    
Weighted average discount rate - operating leases 4.00% 4.00%    
Operating rent expense     $ 40.5 $ 37.5
Consolidated rent expense   $ 45.3    
Expense recorded to reduce carrying value of right-of-use assets to fair value $ 8.1      
Level 3 | Discounted Cash Flow | Price per square foot | Minimum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 13 13    
Level 3 | Discounted Cash Flow | Price per square foot | Maximum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 68 68    
Level 3 | Discounted Cash Flow | Price per square foot | Weighted Average        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 46 46    
Level 3 | Discounted Cash Flow | Discount rate | Minimum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 0.033 0.033    
Level 3 | Discounted Cash Flow | Discount rate | Maximum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 0.055 0.055    
Level 3 | Discounted Cash Flow | Tax rate        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 0.25 0.25