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Subsequent Events (Details) - Subsequent Event [Member]
Jul. 20, 2016
$ / shares
Common Class A [Member]  
Subsequent Event [Line Items]  
Dividends declared (in dollars per share) $ 0.15
Common Stock [Member]  
Subsequent Event [Line Items]  
Dividends declared (in dollars per share) $ 0.150
Minimum [Member]  
Subsequent Event [Line Items]  
Pension plan closure term 18 months
Maximum [Member]  
Subsequent Event [Line Items]  
Pension plan closure term 24 months