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Income Taxes Incomes Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Jul. 31, 2020
Operating Loss Carryforwards [Line Items]              
Income tax provision (benefit) $ 46.0 $ 13.0   $ (57.0) $ (33.0)    
Effective Income Tax Rate Reconciliation, Percent 34.30% 155.00%   12.30% 9.40%    
Decrease resulting from settlements with taxing authorities     $ 19.0        
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount       $ 36.0 $ 25.0    
Less: Net earnings attributable to noncontrolling interest $ 94.0 $ 32.0   $ 189.0 $ 83.0    
Effective Income Tax Rate Reconciliation, period increase/(decrease) due to noncontrolling interest 14.00% 121.60%   8.70% 3.00%    
Income Tax Examination, Interest Income, Net of Tax     13.0        
Deferred Tax Assets, Capital Loss Carryforwards   $ 90.0     $ 90.0    
Deferred Tax Assets, Valuation Allowance   $ 90.0     $ 90.0    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority     108.0        
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority, Withholding Tax Matter           $ 20.0 $ 2.0
Tax Years 2012-2016              
Operating Loss Carryforwards [Line Items]              
Decrease resulting from settlements with taxing authorities $ 15.0            
Domestic Tax Authority              
Operating Loss Carryforwards [Line Items]              
Income Tax Examination, Interest Income     $ 16.0