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SHARE-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
2017
 
2016
 
2015
Restricted shares and restricted share units
$
19.3

 
$
21.8

 
$
22.5

Share appreciation rights
—

 
0.2

 
1.1

Performance-based awards
9.7

 
12.6

 
10.0

Total compensation cost
$
29.0

 
$
34.6

 
$
33.6
Restricted share activity
Activity related to RSAs for the year ended December 31, 2017, is summarized below:
 
Number of Shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Nonvested at January 1, 2017
54

 
$
18.60

Vested
(54
)
 
18.60

Nonvested at December 31, 2017
—

 
$
—
Employee restricted share unit activity
Employee RSU activity for the year ended December 31, 2017, follows:
 
Number of Shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Nonvested at January 1, 2017
2,243

 
$
15.59

Granted
1,501

 
17.09

Vested
(984
)
 
17.96

Forfeited
(324
)
 
15.38

Nonvested at December 31, 2017
2,436

 
$
15.59
Non-employee director deferred restricted share units activity
Directors RSUs for the year ended December 31, 2017, follows:
 
Number of shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Outstanding at January 1, 2017
287

 
$
27.78

Granted
30

 
13.24

Settled
(114
)
 
29.85

Outstanding at December 31, 2017
203

 
$
25.62

 
 
 
 
Vested at December 31, 2017
173

 
$
27.78
Non Employee director non-deferred restricted share activity
Activity related to Directors ND RSUs for the year ended December 31, 2017, follows:
 
Number of shares
 
Weighted-average grant-date fair value per share
 
(in thousands)
 
 
Outstanding at January 1, 2017
—

 
$
—

Granted
91

 
13.24

Settled
—

 
—

Outstanding at December 31, 2017
91

 
$
13.24

 
 
 
 
Vested at December 31, 2017
—

 
$
—
Stock appreciation rights activity
SARs activity for the year ended December 31, 2017, 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, 2017
1,544

 
$
30.67

 
 
 
 
Forfeited or expired
(515
)
 
29.94

 
 
 
 
Outstanding at December 31, 2017
1,029

 
$
31.03

 
3.0
 
$
—

 
 
 
 
 
 
 
 
Exercisable at December 31, 2017
1,029

 
$
31.03

 
3.0
 
$
—
Weighted-average assumptions used to determine fair values of Share Options
Fair values of Share options granted were determined using the Black-Scholes option pricing model with the following weighted-average assumptions:
 
February 22, 2017
Expected life in years
5.5

Risk-free interest rate
1.987
%
Expected volatility
40.551
%
Weighted average grant date per share fair value
$
7.04
Share option activity
Share option activity for the year ended December 31, 2017, 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, 2017
100

 
$
15.31

 
 
 
 
Granted
355

 
17.59

 
 
 
 
Outstanding at December 31, 2017
455

 
$
17.08

 
5.0
 
$
—

 
 
 
 
 
 
 
 
Exercisable at December 31, 2017
100

 
$
15.31

 
0.1
 
$
—