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Other Assets (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Assets [Abstract]      
Amortization of debt issuance costs $ 43.1 $ 79.5 $ 29.6
Debt issuance cost amortization period, end range 2045