Short-Term Borrowings (Narrative) (Details)
$ / shares in Units, $ in Millions |
3 Months Ended |
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Mar. 31, 2016
USD ($)
$ / shares
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Dec. 31, 2015
USD ($)
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Dec. 05, 2014
USD ($)
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| Short-term Debt [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
$ 2,600.0
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| Default Provision Floor |
50.0
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| Letters of Credit |
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| Short-term Debt [Line Items] |
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| Letters of Credit Outstanding, Amount |
0.0
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$ 0.0
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| Revolving Credit Facility |
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| Short-term Debt [Line Items] |
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| Line of Credit Facility, Amount Outstanding |
$ 15.0
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$ 15.0
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| Federal Funds Effective Swap Rate |
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| Short-term Debt [Line Items] |
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| Basis Spread on Variable Rate |
0.50%
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| London Interbank Offered Rate (LIBOR) |
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| Short-term Debt [Line Items] |
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| Basis Spread on Variable Rate |
1.00%
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| Minimum |
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| Short-term Debt [Line Items] |
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| Line of Credit Facility, Commitment Fee Percentage |
0.125%
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| Distribution Made to Limited Partner, Distributions Paid, Per Unit | $ / shares |
$ 0.1675
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| Minimum | Federal Funds Effective Swap Rate |
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| Short-term Debt [Line Items] |
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| Margin Rate |
0.00%
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| Minimum | London Interbank Offered Rate (LIBOR) |
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| Short-term Debt [Line Items] |
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| Margin Rate |
0.00%
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| Minimum | Eurodollar |
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| Short-term Debt [Line Items] |
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| Margin Rate |
1.00%
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| Minimum | Period 1 |
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| Short-term Debt [Line Items] |
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| Ratio of Indebtedness to Net Capital |
5.50
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| Minimum | Period 2 |
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| Short-term Debt [Line Items] |
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| Ratio of Indebtedness to Net Capital |
5.00
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| Minimum | Acquisition Period |
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| Short-term Debt [Line Items] |
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| Ratio of Indebtedness to Net Capital |
5.50
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| Maximum |
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| Short-term Debt [Line Items] |
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| Line of Credit Facility, Commitment Fee Percentage |
0.35%
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| Maximum | Federal Funds Effective Swap Rate |
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| Short-term Debt [Line Items] |
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| Margin Rate |
0.65%
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| Maximum | London Interbank Offered Rate (LIBOR) |
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| Short-term Debt [Line Items] |
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| Margin Rate |
0.65%
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| Maximum | Eurodollar |
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| Short-term Debt [Line Items] |
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| Margin Rate |
1.65%
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| Maximum | Period 1 |
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| Short-term Debt [Line Items] |
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| Ratio of Indebtedness to Net Capital |
1.00
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| Maximum | Period 2 |
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| Short-term Debt [Line Items] |
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| Ratio of Indebtedness to Net Capital |
1.00
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| Maximum | Acquisition Period |
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| Short-term Debt [Line Items] |
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| Ratio of Indebtedness to Net Capital |
1.00
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| Revolving Credit Facility |
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| Short-term Debt [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
$ 500.0
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$ 1,500.0
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| Letters of Credit |
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| Short-term Debt [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
$ 50.0
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