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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation Expense [Table Text Block]
Share-based compensation expense is recognized within "General and administrative" expense on the Condensed Consolidated Statements of Operations and is summarized in the table below. During the three and nine months ended September 30, 2018, the Company recorded an additional $3.2 million and $7.2 million, respectively, of share-based compensation expense related to the acceleration of vesting that occurred as part of the restructuring program, of which $2.2 million for the three and nine months ended September 30, 2018 was recorded in "Net gain (loss) from asset sales, inclusive of restructuring costs" on the Condensed Consolidated Statements of Operations and the remaining $1.0 million and $5.0 million, respectively, are included in share-based compensation expense below (refer to Note 8 – Restructuring for additional information):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Stock options
$
0.2

 
$
0.5

 
$
0.9

 
$
1.7

Restricted share awards
5.3

 
5.4

 
20.9

 
18.7

Performance share units
(2.9
)
 
(0.1
)
 
4.1

 
(6.9
)
Restricted share units
0.1

 
—

 
0.2

 
—

Total share-based compensation expense
$
2.7

 
$
5.8

 
$
26.1

 
$
13.5
Share-based Compensation, Stock Options, Activity [Table Text Block]

Stock option transactions under the terms of the LTSIP are summarized below:
 
Options Outstanding
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
 
Aggregate Intrinsic Value
 
 
 
(per share)
 
(in years)
 
(in millions)
Outstanding at December 31, 2017
2,354,277

 
$
23.62

 
 
 
 
Exercised
(23,337
)
 
10.12

 
 
 
 
Canceled
(232,007
)
 
37.16

 
 
 
 
Outstanding at September 30, 2018
2,098,933

 
$
22.27

 
3.12
 
$
0.5

Options Exercisable at September 30, 2018
1,707,915

 
$
24.04

 
2.68
 
$
0.3

Unvested Options at September 30, 2018
391,018

 
$
14.56

 
5.05
 
$
0.2
Schedule of Share-based Compensation, Restricted Share Awards Activity [Table Text Block]

Transactions involving restricted share awards under the terms of the LTSIP and LTIP are summarized below:
 
Restricted Share Awards Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2017
3,721,334

 
$
13.23

Granted
2,981,589

 
9.56

Vested
(2,344,304
)
 
13.11

Forfeited
(223,222
)
 
10.94

Unvested balance at September 30, 2018
4,135,397

 
$
10.77

Transactions involving restricted share units under the terms of the LTSIP are summarized below:
 
Restricted Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2017
21,946

 
$
13.22

Granted
31,835

 
9.55

Vested
(11,106
)
 
13.27

Unvested balance at September 30, 2018
42,675

 
$
10.47
Schedule of Other Share-based Compensation, PSUs & RSUs [Table Text Block]

Transactions involving performance share units under the terms of the CIP are summarized below:
 
Performance Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2017
1,199,336

 
$
14.59

Granted
724,095

 
9.55

Vested
(277,604
)
 
19.73

Unvested balance at September 30, 2018
1,645,827

 
$
11.47