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Subsequent Event (Details) - Subsequent Event [Member] - USD ($)
$ in Millions
Jun. 07, 2018
Jun. 06, 2018
MAARS [Member]    
Subsequent Event [Line Items]    
Ownership interest, transaction not yet closed   48.00%
Ownership interest purchase, transaction not yet closed   $ 6
HAY [Member]    
Subsequent Event [Line Items]    
Ownership interest 33.00%  
Consideration transferred $ 66  
Trade Names [Member] | HAY [Member]    
Subsequent Event [Line Items]    
Consideration transferred $ 5