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Acquisitions Of Businesses (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 02, 2013
Company
Jul. 29, 2013
Company
May 31, 2013
Company
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Business Acquisition [Line Items]                
Business acquisition date Dec. 02, 2013   May 31, 2013          
Proceeds from revolving credit facility           $ 0 $ 250,000,000  
Goodwill       834,102,000   834,102,000   834,825,000
Number of businesses acquired 1 1 1          
Non-cash income from contingent consideration arrangements       0 3,100,000 200,000 6,000,000  
RepconStrickland [Member]
                
Business Acquisition [Line Items]                
Business acquisition date   Jul. 29, 2013            
Business acquisition, percentage of voting interests acquired   100.00%            
Purchase price   463,600,000            
Proceeds from revolving credit facility   250,000,000            
Working capital acquired   35,500,000            
Other net liabilities acquired   67,100,000            
Goodwill   267,800,000            
Identifiable intangible assets   227,400,000            
Acquired goodwill, tax deductible amount   $ 49,000,000