Borrowings - Partnership's Borrowings (Details) € in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 28, 2017 EUR (€)
Debt Instrument [Line Items]
Borrowing Outstanding	$ 1,334,000,000	$ 1,267,600,000
Carrying Value	1,331,700,000	1,265,200,000
Senior Credit Facility Term Loan Due 5/05/2020
Debt Instrument [Line Items]
Borrowing Outstanding	25,000,000	25,000,000
Carrying Value	$ 24,700,000	$ 24,700,000
Loan maturity date	May 05, 2020	May 05, 2020
CLO Term Loans
Debt Instrument [Line Items]
Borrowing Outstanding	$ 34,100,000	$ 33,800,000
Carrying Value	34,100,000	33,800,000
Euro CLO Financing
Debt Instrument [Line Items]
Borrowing Outstanding	66,100,000	0	€ 61.8
Carrying Value	66,100,000	0
3.875% Senior Notes Due 2/01/2023
Debt Instrument [Line Items]
Borrowing Outstanding	500,000,000	500,000,000
Carrying Value	$ 497,300,000	$ 497,200,000
Loan maturity date	Feb. 01, 2023	Feb. 01, 2023
Interest rate on senior notes (as a percent)	3.875%	3.875%
5.625% Senior Notes Due 3/30/2043
Debt Instrument [Line Items]
Borrowing Outstanding	$ 600,000,000	$ 600,000,000
Carrying Value	$ 600,700,000	$ 600,700,000
Loan maturity date	Mar. 30, 2043	Mar. 30, 2043
Interest rate on senior notes (as a percent)	5.625%	5.625%
Promissory Note Due 1/01/2022
Debt Instrument [Line Items]
Borrowing Outstanding	$ 108,800,000	$ 108,800,000
Carrying Value	$ 108,800,000	$ 108,800,000
Loan maturity date	Jan. 01, 2022	Jan. 01, 2022
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity	$ 750,000,000.0

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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