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SHARE-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Compensation cost charged to expense under all share-based incentive awards
Compensation cost charged to expense under all share-based incentive awards is presented below (in millions):
 
2016
 
2015
 
2014
Restricted shares and restricted share units
$
21.8

 
$
22.5

 
$
23.6

Share appreciation rights
0.2

 
1.1

 
3.7

Performance-based awards
12.6

 
10.0

 
7.2

Total compensation cost
$
34.6

 
$
33.6

 
$
34.5
Restricted share activity
Restricted share activity for the year ended December 31, 2016, is summarized below:
 
Number of Shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Nonvested at January 1, 2016
3

 
$
33.88

Granted
54

 
18.60

Vested
(3
)
 
33.88

Forfeited
—

 
—

Nonvested at December 31, 2016
54

 
$
18.60
Employee restricted share unit activity
Employee RSU activity for the year ended December 31, 2016, follows:
 
Number of Shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Nonvested at January 1, 2016
1,744

 
$
25.42

Granted
1,722

 
11.62

Vested
(919
)
 
26.50

Forfeited
(304
)
 
16.47

Nonvested at December 31, 2016
2,243

 
$
15.59
Non-employee director restricted share units activity
Director RSU activity for the year ended December 31, 2016, follows:
 
Number of shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Outstanding at January 1, 2016
300

 
$
29.51

Granted
41

 
17.43

Settled
(54
)
 
30.64

Outstanding at December 31, 2016
287

 
$
27.78

 
 
 
 
Vested at December 31, 2016
246

 
$
29.51
Stock appreciation rights activity
SARs activity for the year ended December 31, 2016, is summarized below:
 
Number of shares under SARs
 
Weighted-average exercise price
 
Weighted-average remaining contractual term (in years)
 
Aggregate intrinsic value
 
(in thousands)
 
 
 
 
 
(in millions)
Outstanding at January 1, 2016
1,615

 
$
30.66

 
 
 
 
Forfeited or expired
(71
)
 
30.53

 
 
 
 
Outstanding at December 31, 2016
1,544

 
$
30.67

 
3.1
 
$
0.7

 
 
 
 
 
 
 
 
Exercisable at December 31, 2016
1,544

 
$
30.67

 
3.1
 
$
0.7
Share option activity
Share option activity for the year ended December 31, 2016, is summarized below:
 
Number of shares under option
 
Weighted-average exercise price
 
Weighted-average remaining contractual term (in years)
 
Aggregate intrinsic value
 
(in thousands)
 
 
 
 
 
(in millions)
Outstanding at January 1, 2016
125

 
$
21.02

 
 
 
 
Forfeited or expired
(25
)
 
43.85

 
 
 
 
Outstanding at December 31, 2016
100

 
$
15.31

 
1.9
 
$
0.4

 
 
 
 
 
 
 
 
Exercisable at December 31, 2016
100

 
$
15.31

 
1.9
 
$
0.4