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Debt - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument, face amount	$ 375,000,000	$ 375,000,000
Debt instrument, interest rate, stated percentage		4.75%
Debt instrument maturity date		Jul. 15, 2022
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000.0
Debt instrument maturity date	Dec. 19, 2022
Debt instrument, frequency of commitment fee payable	quarterly
Debt instrument, current borrowing capacity	$ 0
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,500,000,000
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, commitment fee percentage	0.225%
Maximum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin	1.625%
Maximum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin	0.625%
Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, commitment fee percentage	0.125%
Minimum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin	1.125%
Minimum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate margin	0.125%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 375,000,000.0
Issue price of senior notes	99.843%
Debt instrument, interest rate, stated percentage	4.75%
Debt instrument maturity date	Jul. 15, 2022
Surplus Note [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 970,400,000
Debt instrument, interest rate, stated percentage	4.50%
Debt instrument maturity date	Dec. 31, 2030

X

- Definition

Issue price of senior notes.

+ 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.

+ Details

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Description of when the fee for available but unused credit capacity is required to be paid (for example, annually, quarterly, or monthly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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