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Stock-based Compensation Plans - Schedule of PSU and RSU Plans Activity (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Number of Awards
Awards paid out (shares)	(1,041,450)
Outstanding, end of year (shares)	2,345,174
PSUs
Number of Awards
Outstanding, beginning of year (shares)	694,386	481,700
Granted (shares)	351,737	276,381
Granted - notional dividends reinvested (shares)	34,439	25,687
Awards paid out (shares)	(148,168)	(83,637)
Cancelled/forfeited (shares)	(443)	(5,745)
Outstanding, end of year (shares)	931,951	694,386
PSUs | Senior management
Number of Awards
Awards paid out (shares)	(2,432)
RSUs
Number of Awards
Outstanding, beginning of year (shares)	58,740	0
Granted (shares)	70,393	59,462
Granted - notional dividends reinvested (shares)	4,709	2,150
Awards paid out (shares)	(10,201)	0
Cancelled/forfeited (shares)	(29)	(2,872)
Outstanding, end of year (shares)	123,612	58,740

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Notional Dividends Reinvested in Period

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Number of share options (or share units) exercised during the current period.

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