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Variable Interest Entities - Recent Accounting Pronouncement (Details) - USD ($)
$ in Millions
Jan. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Consolidated assets   $ 243,036.1 $ 253,941.2    
Consolidated liabilities   231,188.9 240,918.0    
Redeemable noncontrolling interest   $ 391.2 $ 101.3 $ 97.5 $ 85.7
New Accounting Pronouncement | Accounting Standards Update 2015-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deconsolidated assets $ 8,600.0        
Deconsolidated liabilities 8,600.0        
Cumulative effect adjustment, increase to retained earnings 0.0        
Consolidated assets 180.1        
Consolidated liabilities 0.6        
Redeemable noncontrolling interest $ 179.5