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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Payment Arrangements [Abstract]  
Other equity instruments activity
DSU and RSU Activity
 
DSUs
Fair value
RSUs
Fair value
At January 1, 2016
465


$3.5

6,627


$24.6

Settled for cash
(26
)
(0.4
)
(1,102
)
(22.7
)
Forfeited
—

—

(2,952
)
(46.3
)
Granted
134

2.2

3,836

55.0

Credits for dividends
—

—

43

0.7

Change in value
—

3.8

—

47.3

At December 31, 2016
573


$9.2

6,452


$58.6

Settled for cash
—

—

(3,610
)
(62.5
)
Forfeited
—

—

(121
)
(2.3
)
Granted
152

2.5

1,760

32.7

Credits for dividends
—

—

56

0.9

Change in value
—

(0.1
)
—

10.3

At December 31, 2017
725


$11.6

4,537


$37.7
Employee stock option activity
  
2017
2016
 
Shares

Average Price

Shares

Average Price

C$ options
 
 
 
 
At January 1
0.3


$13

0.3


$13

Granted
—

—

—

—

Cancelled/expired
—

—

—

—

At December 31
0.3


$13

0.3


$13

US$ options
 
 
 
 
At January 1
1.8


$42

2.6


$42

Forfeited
(0.7
)
40

(0.4
)
45

Cancelled/expired
(0.4
)
45

(0.4
)
39

At December 31
0.7


$40

1.8


$42
Stock options outstanding
 
Outstanding
Exercisable
Range of exercise prices
Shares

Average price

Average life (years)

Intrinsic value1 ($ millions)

Shares

Average price

Intrinsic value1 ($ millions)

C$ options
 
 
 
 
 
 
 
$ 9 - $ 17
0.2


$10

4.6


$2

0.1


$10


$1

$ 18 - $ 21
0.1

18

2.6

—

0.1

18

—

 
0.3


$13

3.9


$2

0.2


$14


$1

US$ options
 
 
 
 
 
 
 
$ 32 - $ 41
0.4


$32

2.0


$—

0.4


$33


$—

$ 42 - $ 55
0.3

49

1.0

—

0.3

49

—

 
0.7


$40

1.5


$—

0.7


$40


$—

1 Based on the closing market share price on December 31, 2017 of C $18.18 and US $14.47.
Stock options outstanding and exercisable
 
Outstanding
Exercisable
Range of exercise prices
Shares

Average price

Average life (years)

Intrinsic value1 ($ millions)

Shares

Average price

Intrinsic value1 ($ millions)

C$ options
 
 
 
 
 
 
 
$ 9 - $ 17
0.2


$10

4.6


$2

0.1


$10


$1

$ 18 - $ 21
0.1

18

2.6

—

0.1

18

—

 
0.3


$13

3.9


$2

0.2


$14


$1

US$ options
 
 
 
 
 
 
 
$ 32 - $ 41
0.4


$32

2.0


$—

0.4


$33


$—

$ 42 - $ 55
0.3

49

1.0

—

0.3

49

—

 
0.7


$40

1.5


$—

0.7


$40


$—

1 Based on the closing market share price on December 31, 2017 of C $18.18 and US $14.47.