Transactions With Affiliates (Schedule of Long-term Debt) (Details) - Notes Due 2020 - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Dec. 31, 2015 |
|
| Schedule of Related Party Transactions, Long-Term Debt [Line Items] | ||
| Debt Instrument, Issuance Date | Dec. 09, 2013 | |
| Debt Instrument, Interest Rate, Stated Percentage | 4.70% | |
| Debt Instrument, Maturity Date | Dec. 31, 2020 | |
| Long-term Debt | $ 630.9 | $ 630.9 |