Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

No definition available.

+ Details

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Definition

The maximum regular quarterly dividend permitted to be paid prior to closing, persuant to the Merger Agreement.

+ References

No definition available.

+ Details

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- Details

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- Details

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Subsequent events (Details) - $ / shares		3 Months Ended								12 Months Ended
Subsequent events (Details) - $ / shares	Feb. 07, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 21, 2018
Subsequent Event [Line Items]
Cash dividends declared per share - common		$ 0.38	$ 0.38	$ 0.38	$ 0.38	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 1.52	$ 1.40	$ 1.28
Common shares
Subsequent Event [Line Items]
Cash dividends declared per share - common		$ 0.38	$ 0.38	$ 0.38	$ 0.38	$ 0.35	$ 0.35	$ 0.35	$ 0.35
Subsequent event \| Common shares
Subsequent Event [Line Items]
Merger agreement, maximum permitted dividend per share													$ 0.38
Cash dividends declared per share - common	$ 0.38
Subsequent event \| Series A Preferred Shares
Subsequent Event [Line Items]
Cash dividends declared per share - preferred	0.3671875
Subsequent event \| Series B Preferred Shares
Subsequent Event [Line Items]
Cash dividends declared per share - preferred	$ 0.3625000
Subsequent event \| AIG
Subsequent Event [Line Items]
Merger agreement, cash consideration per share													$ 68.00