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Debt (Maturities On Long-Term Debt For Each Of The Next Five Years) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2017 $ 44,700,000  
2018 34,150,000  
2019 34,150,000  
2020 34,150,000  
2021 34,150,000  
Debt Instrument [Line Items]    
Principal amount 8,391,518,000 $ 8,398,930,000
Senior Notes | 2017 Credit Agreement    
Debt Instrument [Line Items]    
Principal amount $ 1,100,000,000.0