Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions (Narrative) (Details)

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Business Acquisitions (Narrative) (Details) - Witt O'Brien's LLC [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Jul. 11, 2014
Business Acquisition [Line Items]    
Business Acquisition, Percentage of Voting Interests Acquired   45.80%
Payments to Acquire Businesses, Gross $ 35.4  
Goodwill, Gross   $ 45.0