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Subsequent Events - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 08, 2018
Dec. 31, 2017
Sep. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]        
Shares repurchased during period (in shares)     (3.0) (5.7)
Value of shares repurchased during period   $ (8.0) $ (23.8) $ (52.8)
Weighted average price of shares repurchased (in dollars per share)     $ 7.86 $ 9.22
Share repurchase program, unfulfilled requests (in shares)     12.0  
Share repurchase program, unfulfilled requests     $ 101.8  
Estimated value per share (in dollars per share)     $ 8.50  
Subsequent event        
Subsequent Event [Line Items]        
Shares repurchased during period (in shares) (0.2)      
Value of shares repurchased during period $ (2.1)      
Weighted average price of shares repurchased (in dollars per share) $ 8.50