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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 27, 2015
Jul. 22, 2015
May. 31, 2015
Subsequent Event [Line Items]      
Remaining authorized repurchase amount     $ 9.9
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Increase in authorized amount   $ 50.0  
Remaining authorized repurchase amount $ 59.9    
Subsequent Event [Member] | Common Class A [Member]      
Subsequent Event [Line Items]      
Dividends declared (in dollars per share)   $ 0.15