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Income Taxes - Reorganization Transactions - (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 01, 2016
May 31, 2018
Feb. 28, 2017
Dec. 31, 2016
Sep. 30, 2018
BNP Paribas          
Income taxes          
Ownership below percentage amount   50.00% 80.00%    
Reorganization Transactions on April 1, 2016          
Income taxes          
Current tax receivables recorded         $ 93.9
Unrecognized tax positions         116.5
Indemnification receivable         $ 22.6
Certain tax related liabilities incurred $ 95.4        
Expected federal tax benefit on distribution taxes 33.4        
Total state and local distribution taxes reported       $ 92.1  
Net adjustments to pre-Reorganization indemnification receivables or payables and unrecognized tax benefits $ 2.1