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Leases Lease Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]      
Impairment of Leasehold $ 5.6    
Debtor Reorganization Items, Provision for Expected Allowed Claims 4.4    
Change in Right of use asset 10.5    
Change in Lease Liabilities 20.4    
Change in Right of use asset for Corporate Headquarters in Houston, Texas 6.4    
Change in lease liability for Corporate Headquarters in Houston, Texas 10.4    
Operating Leases, Rent Expense     $ 40.1
Cash paid for lease liabilities 23.5 $ 29.9  
Contract items 11.5    
Certain rejected office leases [Member]      
Operating Leased Assets [Line Items]      
Contract items (9.8)    
Corporate Office [Member]      
Operating Leased Assets [Line Items]      
Contract items $ (1.7)    
Minimum      
Operating Leased Assets [Line Items]      
Remaining lease terms 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Remaining lease terms 10 years