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Subsequent Events - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 04, 2017
Jun. 30, 2017
Dec. 31, 2016
Subsequent Event [Line Items]      
Shares repurchased during period (in shares)   2.1 1.8
Value of shares repurchased during period   $ 19.2 $ 16.1
Weighted average price of shares repurchased (in dollars per share)   $ 9.21 $ 9.15
Subsequent event      
Subsequent Event [Line Items]      
Shares repurchased during period (in shares) 1.6    
Value of shares repurchased during period $ 14.9    
Weighted average price of shares repurchased (in dollars per share) $ 9.23