Long Term Debt and Other Borrowings - Term Loan Agreement Narrative (Details) - Senior unsecured term loan facility	May 13, 2016 USD ($)
Amended and Restated Term Loan Agreement
Debt Instrument [Line Items]
Principal amount	$ 1,530,000,000
Amended and Restated Term Loan Agreement \| Minimum
Debt Instrument [Line Items]
Unencumbered cash and investments	$ 1,000,000,000
Amended and Restated Term Loan Agreement \| Maximum
Debt Instrument [Line Items]
Ratio of indebtedness to net capital	0.005
Debt to EBITDA ratio	4.5
Amended and Restated Term Loan Agreement \| Federal Funds rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	0.50%
3-Year Tranche
Debt Instrument [Line Items]
Principal amount	$ 1,005,000,000
Debt term	3 years
3-Year Tranche \| One-month LIBOR
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	1.00%
3-Year Tranche \| One-month LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	0.00%
3-Year Tranche \| One-month LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	0.75%
3-Year Tranche \| LIBOR multiplied by the statutory reserve rate \| Minimum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	1.00%
3-Year Tranche \| LIBOR multiplied by the statutory reserve rate \| Maximum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	1.75%
5-Year Tranche
Debt Instrument [Line Items]
Principal amount	$ 525,000,000
Debt term	5 years
5-Year Tranche \| One-month LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	0.125%
5-Year Tranche \| One-month LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	1.00%
5-Year Tranche \| LIBOR multiplied by the statutory reserve rate \| Minimum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	1.125%
5-Year Tranche \| LIBOR multiplied by the statutory reserve rate \| Maximum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate (percent)	2.00%

Debt Instrument, Covenant, EBITA Ratio, Minimum

No definition available.

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- Definition

Minimum value of cash required under the referenced debt arrangement deemed sufficient to cover current obligations. Liquidity levels lower than this value could result in the company's default under the provisions of debt agreements.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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=34725769&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=6451184&loc=d3e28551-108399

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- Definition

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.

+ References

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

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