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Shareholders' Equity - Share Repurchase and Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 23, 2018
Feb. 22, 2016
Mar. 31, 2018
Mar. 31, 2017
Shareholders' Equity        
Dividend declared per common share (in dollars per share)   $ 0.04 $ 0.04 $ 0.04
Target dividend per annum (in dollars per share)     $ 0.16  
Dividends paid, aggregate cost $ 6.3   $ 6.3 $ 6.4
May 2017 Repurchase Program        
Shareholders' Equity        
Amount approved for repurchase of common stock     $ 225.0  
Common stock repurchased during the period (in shares)     0