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Organization and Description of the Business - Schedule of Equity Share Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 25, 2019
Feb. 21, 2019
Nov. 19, 2018
Nov. 17, 2017
Nov. 10, 2017
May 19, 2017
May 12, 2017
Dec. 16, 2016
Jun. 22, 2015
Oct. 15, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]                          
Issuance of ordinary shares (in shares) 14,790,038   4,598,566 6,039,630   19,895,000   14,950,000 15,295,000 24,231,375      
Repurchase of common stock (in shares)           5,000,000   6,000,000     19,479,945 5,549,861 0
Repurchase of ordinary shares                     $ 236.5 $ 74.6 $ 73.1
Stock repurchased and retired during period (in shares) 3,886,625 4,100,000                      
Sale of stock number of shares issued (in shares)         15,960,553   11,414,676            
Overallotment option                          
Subsidiary, Sale of Stock [Line Items]                          
Issuance of ordinary shares (in shares)           2,595,000   1,950,000 1,995,000 2,231,375      
HNA Capital US                          
Subsidiary, Sale of Stock [Line Items]                          
Percent ownership after sale of stock transaction 0.00%   21.40% 24.95% 24.95% 0.00% 9.95% 0.00% 0.00% 0.00%      
Stock repurchased and retied during period, percent ownership after transaction 16.00% 19.40%       10.40%   0.00%          
Paulson                          
Subsidiary, Sale of Stock [Line Items]                          
Percent ownership after sale of stock transaction 21.70%   4.90% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%      
Stock repurchased and retied during period, percent ownership after transaction 5.70% 5.40%       0.00%   0.00%          
Parent                          
Subsidiary, Sale of Stock [Line Items]                          
Percent ownership after sale of stock transaction 0.00%   0.00% 0.00% 5.51% 0.00% 40.90% 0.00% 65.80% 78.80%      
Stock repurchased and retied during period, percent ownership after transaction 0.00% 0.00%       20.10%   51.10%          
Sale of stock number of shares issued (in shares)       1,000