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Subsequent Events - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 08, 2019
Dec. 31, 2017
Mar. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]        
Shares repurchased during period (in shares)     0.3 3.3
Value of shares repurchased during period   $ 8.0 $ 2.0 $ 25.9
Weighted average price of shares repurchased (in dollars per share)     $ 7.10 $ 7.91
Share repurchase program, unfulfilled requests (in shares)     12.0  
Share repurchase program, unfulfilled requests     $ 85.0  
Stock repurchase program, unfilled requests, value per share (in dollars per share)     $ 7.10  
Subsequent event        
Subsequent Event [Line Items]        
Shares repurchased during period (in shares) 0.5      
Value of shares repurchased during period $ 3.2      
Weighted average price of shares repurchased (in dollars per share) $ 7.10