Actual interest rate percentage of credit facility at period end.

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Amount represents the portion payable in a promissory note of a contingent consideration to one company as part of our strategic investment in another company

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Debt instrument percent to par value.

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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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No definition available.

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- Definition

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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No definition available.

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- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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

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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) € in Millions			1 Months Ended		3 Months Ended		12 Months Ended
Borrowings - Additional Information (Details) € in Millions	Feb. 28, 2017 EUR (€)	Oct. 03, 2013 EUR (€)	Mar. 31, 2013 USD ($)	Jan. 31, 2013 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Apr. 06, 2017 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jan. 01, 2016 USD ($)	Mar. 31, 2014 USD ($)
Debt Instrument [Line Items]
Debt principal amount					$ 1,334,000,000		$ 1,267,600,000
Carrying Value					1,331,700,000		1,265,200,000
Interest expense					15,000,000	$ 15,300,000
Amount of promissory note for strategic investment contingent consideration										$ 120,000,000
Fair value of collateralized loan obligation assets					4,300,000,000		4,700,000,000
Long-term debt outstanding					141,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity					750,000,000.0
Outstanding borrowings under credit facility					$ 0
3.875% Senior Notes Due 2/01/2023
Debt Instrument [Line Items]
Debt principal amount				$ 500,000,000.0
Loan maturity date					Feb. 01, 2023
Interest rate on senior notes (as a percent)				3.875%
Senior notes percentage of par value				99.966%
Date of first required interest payment					Aug. 01, 2013
Senior notes redemption terms percentage to principal amount				100.00%
Interest expense					$ 5,000,000	5,000,000
Fair value of notes payable					$ 511,700,000		512,800,000
3.875% Senior Notes Due 2/01/2023 \| 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
Loan maturity date					Mar. 30, 2043
Interest rate on senior notes (as a percent)			5.625%									5.625%
Senior notes percentage of par value			99.583%									104.315%
Date of first required interest payment					Sep. 30, 2013
Senior notes redemption terms percentage to principal amount			100.00%
Interest expense					$ 8,400,000	$ 8,400,000
Fair value of notes payable					619,300,000		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		25,000,000
Carrying Value					$ 24,700,000		$ 24,700,000
Loan maturity date					May 05, 2020		May 05, 2020
October 2013 CLO Term Loan
Debt Instrument [Line Items]
Debt principal amount		€ 12.6			$ 13,500,000		$ 13,200,000
Loan maturity date					Sep. 28, 2018		Sep. 28, 2018
Interest rate spread on term loan to fund investment in a CLO (as a percent)		1.75%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum percentage of applicable margin in addition to base rate					0.75%
Maximum percentage of applicable margin					1.75%
Actual percentage at period end					1.92%
January 2017 Term Loan [Member]
Debt Instrument [Line Items]
Borrowing capacity									$ 100,000,000
Euro CLO Financing
Debt Instrument [Line Items]
Debt principal amount	€ 61.8				$ 66,100,000		$ 0
Carrying Value					66,100,000		0
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%
Promissory Note Due 1/01/2022
Debt Instrument [Line Items]
Debt principal amount					108,800,000		108,800,000
Carrying Value					$ 108,800,000		$ 108,800,000
Loan maturity date					Jan. 01, 2022		Jan. 01, 2022
Actual percentage at period end					3.65%
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%
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
Subsequent Event \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding borrowings under credit facility								$ 250,000,000