Common Stock, Dividends, Per Share, Declared, Increase Pending Merger Date

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- Definition

Line Of Credit Facility, Number Of Extension Options

+ References

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- Definition

Line Of Credit Facility, Optional Extension Period

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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

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

Per share amount of cumulative preferred dividends in arrears.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644

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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.

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SUBSEQUENT EVENTS - Narrative (Details)					6 Months Ended
SUBSEQUENT EVENTS - Narrative (Details)	Aug. 02, 2017 $ / shares	Jul. 31, 2017 USD ($) extension_option	May 08, 2017 $ / shares	Feb. 03, 2017 $ / shares	Jun. 30, 2017 $ / shares	Jun. 30, 2016 $ / shares	Jul. 31, 2017 CAD extension_option	Jul. 30, 2017 USD ($)	Aug. 10, 2016 USD ($)	Aug. 10, 2016 CAD	Jan. 14, 2016 USD ($)	Jan. 14, 2016 CAD
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share) \| $ / shares			$ 0.43	$ 0.42	$ 0.85	$ 0.83
U.S. Dollar Term Loan [Member]
Subsequent Event [Line Items]
Debt amount									$ 245,000,000		$ 245,000,000.0
Canadian Term Loan [Member]
Subsequent Event [Line Items]
Debt amount \| CAD										CAD 35,000,000		CAD 125,000,000.0
Prior Credit Agreement [Member] \| Line of Credit [Member]
Subsequent Event [Line Items]
Borrowing capacity											$ 1,250,000,000
Subsequent Event [Member] \| U.S. Dollar Term Loan [Member]
Subsequent Event [Line Items]
Debt amount		$ 1,100,000,000.0
Subsequent Event [Member] \| U.S. Dollar Term Loan [Member] \| Third Anniversary [Member]
Subsequent Event [Line Items]
Debt amount		200,000,000
Subsequent Event [Member] \| U.S. Dollar Term Loan [Member] \| Fifth Anniversary [Member]
Subsequent Event [Line Items]
Debt amount		900,000,000
Subsequent Event [Member] \| Canadian Term Loan [Member]
Subsequent Event [Line Items]
Debt amount \| CAD							CAD 125,000,000
Subsequent Event [Member] \| Credit Agreement [Member] \| Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Borrowing capacity		$ 1,000,000,000.0
Number of optional extensions \| extension_option		2					2
Optional extension period		6 months
Subsequent Event [Member] \| Credit Agreement [Member] \| Line of Credit [Member]
Subsequent Event [Line Items]
Borrowing capacity		$ 2,500,000,000
Subsequent Event [Member] \| Prior Credit Agreement [Member] \| Line of Credit [Member]
Subsequent Event [Line Items]
Borrowing capacity								$ 1,250,000,000.00
Subsequent Event [Member] \| Dividend Declared [Member]
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share) \| $ / shares	$ 0.3598913
Increase in common dividends pending Merger closing (in dollars per share) \| $ / shares	0.0046739
Preferred stock dividends, declared (in dollars per share) \| $ / shares	$ 0.4453125