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Debt (Aggregate Maturities Of Long-Term Debt) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Instruments [Abstract]  
2016 $ 0.0
2017 0.0
2018 0.0
2019 500.0
2020 900.0
Thereafter 4,300.0
Total $ 5,700.0