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Special Charges (Notes)	6 Months Ended
Special Charges (Notes)	Sep. 30, 2016
Other Nonrecurring (Income) Expense [Abstract]
Special charges	Special Charges The Company incurred special charges related to severance, office closing and other costs associated with its acquisition activity of $9.5 million and $31.6 million for the three and six months ended September 30, 2016, respectively (of which $25.6 million was paid during the six months ended September 30, 2016) compared to $6.6 million and $8.2 million for the three and six months ended September 30, 2015, respectively.