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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 |

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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 + Details
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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 + Details
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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 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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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. + Details
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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 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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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 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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