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Debt instrument percent to par value.

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Debt instrument, Prepayment Terms, Penalty Period Threshold

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Fair value of collateralized loan obligation assets.

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Maximum percentage of applicable margin.

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Maximum percentage of applicable margin in addition to base rate.

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Percentage of basis spread on promissory note

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Senior notes option to redeem price equal to percentage of principal.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount of the cost of borrowed funds accounted for as interest expense.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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).

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Fair value portion of notes payable.

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Borrowings - Additional Information (Details)		1 Months Ended		3 Months Ended		9 Months Ended
Borrowings - Additional Information (Details)	Sep. 30, 2017 USD ($)	Mar. 31, 2013 USD ($)	Jan. 31, 2013 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) vehicle	Apr. 06, 2017 USD ($)	Feb. 28, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Jan. 31, 2016 USD ($)	Jan. 01, 2016 USD ($)	Mar. 31, 2014 USD ($)
Debt Instrument [Line Items]
Debt principal amount	$ 1,517,600,000			$ 1,517,600,000		$ 1,517,600,000					$ 1,267,600,000
Term loan carrying value	1,515,600,000			1,515,600,000		1,515,600,000					1,265,200,000
Interest expense				16,900,000	$ 15,600,000	48,400,000	$ 46,300,000
Amount of promissory note for strategic investment contingent consideration												$ 120,000,000
Derivatives, number of commodities investment vehicles settled \| vehicle								2
Fair value of collateralized loan obligation assets	4,500,000,000			4,500,000,000		4,500,000,000					4,700,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity	750,000,000.0			750,000,000.0		750,000,000.0
Outstanding borrowings under credit facility	0			0		0			$ 250,000,000
Interest expense				0	0	0	0
Senior Notes
Debt Instrument [Line Items]
Debt principal amount			$ 500,000,000.0
Interest rate on senior notes (as a percent)			3.875%
Senior notes percentage of par value (percent)			99.966%
Senior notes redemption terms percentage to principal amount			100.00%
Interest expense				5,000,000	5,000,000	14,900,000	14,900,000
Fair value of notes payable	520,800,000			520,800,000		520,800,000					512,800,000
Senior Notes \| Treasury Rate
Debt Instrument [Line Items]
Interest rate spread on term loan to fund investment in a CLO (as a percent)			30.00%
5.625% Senior Notes Due 3/30/2043
Debt Instrument [Line Items]
Debt principal amount		$ 400,000,000.0												$ 200,000,000.0
Interest rate on senior notes (as a percent)		5.625%												5.625%
Senior notes percentage of par value (percent)		99.583%												104.315%
Senior notes redemption terms percentage to principal amount		100.00%
Interest expense				8,400,000	8,400,000	25,300,000	25,300,000
Fair value of notes payable	688,700,000			688,700,000		688,700,000					603,100,000
5.625% Senior Notes Due 3/30/2043 \| Treasury Rate
Debt Instrument [Line Items]
Interest rate spread on term loan to fund investment in a CLO (as a percent)		40.00%
Senior Credit Facility Term Loan Due 5/05/2020
Debt Instrument [Line Items]
Debt principal amount	25,000,000.0			25,000,000.0		25,000,000.0					25,000,000
Term loan carrying value	$ 24,800,000			$ 24,800,000		$ 24,800,000					24,700,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum percentage of applicable margin in addition to base rate (percent)	0.75%			0.75%		0.75%
Maximum percentage of applicable margin (percent)	1.75%			1.75%		1.75%
Actual percentage at period end (percent)						2.49%
Euro CLO Financing
Debt Instrument [Line Items]
Debt principal amount \| €										€ 61,800,000.0
Term loan carrying value	$ 73,000,000			$ 73,000,000		$ 73,000,000
Repayment with penalty period						3 years
Euro CLO Financing \| Euribor
Debt Instrument [Line Items]
Interest rate spread on term loan to fund investment in a CLO (as a percent)	2.33%
5.625% Senior Notes Due 3/30/2043
Debt Instrument [Line Items]
Debt principal amount	$ 600,000,000			600,000,000		$ 600,000,000					600,000,000
Term loan carrying value	$ 600,700,000			$ 600,700,000		$ 600,700,000					600,700,000
Interest rate on senior notes (as a percent)	5.625%			5.625%		5.625%
Promissory Note Due 1/01/2022
Debt Instrument [Line Items]
Actual percentage at period end (percent)						3.83%
Amount of promissory note for strategic investment contingent consideration													$ 120,000,000.0
Basis spread of variable rate promissory note (as a percent)						2.50%
Promissory Note Due 1/01/2022 \| LIBOR
Debt Instrument [Line Items]
Debt principal amount	$ 108,800,000			$ 108,800,000		$ 108,800,000					108,800,000
Term loan carrying value	108,800,000			108,800,000		108,800,000					108,800,000
Promissory Notes Due 7/15/2019 \| LIBOR
Debt Instrument [Line Items]
Debt principal amount	$ 53,900,000			53,900,000		53,900,000		$ 53,900,000			0
Actual percentage at period end (percent)	3.33%
Term loan carrying value	$ 53,900,000			53,900,000		53,900,000					0
Interest rate spread on term loan to fund investment in a CLO (as a percent)	2.00%
CLO Term Loans
Debt Instrument [Line Items]
Debt principal amount	$ 229,900,000			229,900,000		229,900,000					33,800,000
Term loan carrying value	229,900,000			229,900,000		229,900,000					33,800,000
Interest expense				0	$ 0	0	$ 0
Commercial Paper \| Promissory Note Maturing January 1, 2022
Debt Instrument [Line Items]
Debt repurchased											11,200,000
Purchase price of debt repurchased											9,000,000
Long-term debt outstanding	$ 108,800,000			$ 108,800,000		$ 108,800,000					$ 108,800,000