XML 130 R123.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Preference Shares - Characteristics of Preference Shares (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2015 CAD / shares | May 31, 2015 CAD / shares | Dec. 31, 2016 CAD / shares | Dec. 01, 2021 CAD / shares | Jun. 01, 2020 CAD / shares | Dec. 01, 2018 CAD / shares | Jun. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares rate dividend term |  |  | 5 years |  |  |  |
Series F |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Initial yield (percent) |  |  | 4.90% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 1.2250 |  |  |  |
Reset Dividend Yield (percent) |  |  | 0.00% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 25.00 |  |  |  |
Series J |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Initial yield (percent) |  |  | 4.75% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 1.1875 |  |  |  |
Reset Dividend Yield (percent) |  |  | 0.00% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 26.00 |  |  |  |
Series J | Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redemption price (CAD per share) |  |  |  | CAD 25.00 |  | CAD 26.00 |
Preferred stock redemption price per share annual decrease (CAD per share) |  |  |  |  |  | CAD 0.25 |
Series G |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Initial yield (percent) |  |  | 5.25% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 0.9708 |  |  |  |
Reset Dividend Yield (percent) |  |  | 2.13% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 25.00 |  |  |  |
Series H |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares exchange ratio |  |  | 1 |  |  |  | 1
Initial yield (percent) |  |  | 4.25% |  |  |  |
Annual Dividend (CAD per share) | CAD 0.6250 | CAD 1.0625 | CAD 0.6250 |  |  |  |
Reset Dividend Yield (percent) |  |  | 1.45% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 25.00 |  |  |  |
Preferred shares rate dividend term | 5 years |  |  |  |  |  |
Series K |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares exchange ratio |  |  | 1 |  |  |  |
Initial yield (percent) |  |  | 4.00% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 1.0000 |  |  |  |
Reset Dividend Yield (percent) |  |  | 2.05% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 25.00 |  |  |  |
Series M |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares exchange ratio |  |  | 1 |  |  |  |
Initial yield (percent) |  |  | 4.10% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 1.0250 |  |  |  |
Reset Dividend Yield (percent) |  |  | 2.48% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 25.00 |  |  |  |
Series I |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares exchange ratio |  |  | 1 |  |  |  |
Initial yield (percent) |  |  | 2.10% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 0 |  |  |  |
Reset Dividend Yield (percent) |  |  | 1.45% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 25.50 |  |  |  |
Series I | Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redemption price (CAD per share) |  |  |  |  | CAD 25.00 |  |
Series L |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares exchange ratio |  |  | 1 |  |  |  |
Initial yield (percent) |  |  | 0.00% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 0 |  |  |  |
Reset Dividend Yield (percent) |  |  | 2.05% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 0 |  |  |  |
Series N |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares exchange ratio |  |  | 1 |  |  |  |
Initial yield (percent) |  |  | 0.00% |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 0 |  |  |  |
Reset Dividend Yield (percent) |  |  | 2.48% |  |  |  |
Redemption price (CAD per share) |  |  | CAD 0 |  |  |  |
Fixed rate reset |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Annual Dividend (CAD per share) |  |  | CAD 25.00 |  |  |  |

X
- Definition Preferred Stock, Exchange Ratio + References No definition available. + Details
Name: | fts_PreferredStockExchangeRatio
Namespace Prefix: | fts_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred Stock, Rate Dividend, Term + References No definition available. + Details
Name: | fts_PreferredStockRateDividendTerm
Namespace Prefix: | fts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred Stock, Redemption Price Per Share, Annual Decrease + References No definition available. + Details
Name: | fts_PreferredStockRedemptionPricePerShareAnnualDecrease
Namespace Prefix: | fts_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred Stock, Reset Dividend Yield Rate, Percentage + References No definition available. + Details
Name: | fts_PreferredStockResetDividendYieldRatePercentage
Namespace Prefix: | fts_
Data Type: | num:percentItemType
Balance Type: | na
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 amount per share used to calculated dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePerDollarAmount
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
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 The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
Name: | us-gaap_PreferredStockRedemptionPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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