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Debt - Narrative (Details) | 6 Months Ended
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Jun. 30, 2018 USD ($)
Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Debt instrument, face amount | $ 200,000,000
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 | $ 1,300,000,000
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
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 | $ 843,800,000
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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Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Period Type: | instant

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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. + Details
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Balance Type: | na
Period Type: | duration

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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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Balance Type: | na
Period Type: | duration

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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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Balance Type: | na
Period Type: | duration

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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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Balance Type: | credit
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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- Details
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- Details
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- Details
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- Details
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