Quarterly report pursuant to Section 13 or 15(d)

Common Stock Repurchase Plan (Details)

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Common Stock Repurchase Plan (Details) - The Program - Common Stock - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Mar. 06, 2017
Class of Stock [Line Items]      
Stock repurchase program, authorized amount     $ 50.0
Common stock repurchased (in shares) 500,000.0 800,000.0  
Common stock repurchased, value $ 9.5 $ 14.4  
Common stock repurchased (in dollars per share) $ 18.43 $ 18.39