XML 169 R150.htm IDEA: XBRL DOCUMENT
v3.19.1

Capital Structure - Outstanding preferred stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 79,800 | 72,200 |
Aggregate liquidation preference | $ 1,995.0 | $ 1,805.0 |
Aggregate dividend payment | 134.0 | $ 116.0 | $ 116.0
Excess redemption price over carrying value | $ 13.0 |  |
Series A |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 11,500 | 11,500 |
Aggregate liquidation preference | $ 287.5 | $ 287.5 |
Dividend rate | 5.625% |  |
Dividends payable, amount per share (in usd per share) | $ 1.41 | $ 1.41 | $ 1.41
Aggregate dividend payment | $ 16.0 | $ 16.0 | $ 16.0
Series C |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 0 | 15,400 |
Aggregate liquidation preference | $ 0.0 | $ 385.0 |
Dividend rate | 6.75% |  |
Dividends payable, amount per share (in usd per share) | $ 1.69 | $ 1.69 | $ 1.69
Aggregate dividend payment | $ 26.0 | $ 26.0 | $ 26.0
Series D |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 5,400 | 5,400 |
Aggregate liquidation preference | $ 135.0 | $ 135.0 |
Dividend rate | 6.625% |  |
Dividends payable, amount per share (in usd per share) | $ 1.66 | $ 1.66 | $ 1.66
Aggregate dividend payment | $ 9.0 | $ 9.0 | $ 9.0
Series E |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 29,900 | 29,900 |
Aggregate liquidation preference | $ 747.5 | $ 747.5 |
Dividend rate | 6.625% |  |
Dividends payable, amount per share (in usd per share) | $ 1.66 | $ 1.66 | $ 1.66
Aggregate dividend payment | $ 49.0 | $ 49.0 | $ 49.0
Series F |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 10,000 | 10,000 |
Aggregate liquidation preference | $ 250.0 | $ 250.0 |
Dividend rate | 6.25% |  |
Dividends payable, amount per share (in usd per share) | $ 1.56 | $ 1.56 | $ 1.56
Aggregate dividend payment | $ 16.0 | $ 16.0 | $ 16.0
Series G |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 23,000 | 0 |
Aggregate liquidation preference | $ 575.0 | $ 0.0 |
Dividend rate | 5.625% |  |
Dividends payable, amount per share (in usd per share) | $ 1.41 | $ 0 | $ 0
Aggregate dividend payment | $ 18.0 | $ 0.0 | $ 0.0

X
- Definition Preferred Stock Dividends Income Statement Impact, Redemption Price In Excess Of Carrying Value + References No definition available. + Details
Name: | all_PreferredStockDividendsIncomeStatementImpactRedemptionPriceInExcessOfCarryingValue
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References No definition available. + Details
Name: | all_ProceedsFromIssuanceOfPreferredStockGross
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=all_SeriesANoncumulativePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=all_SeriesCNoncumulativePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=all_SeriesDNoncumulativePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=all_SeriesENoncumulativePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=all_SeriesFNoncumulativePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=all_SeriesGNoncumulativePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |