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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation Expense [Table Text Block]
Share-based compensation expense is generally recognized within "General and administrative" expense on the Condensed Consolidated Statements of Operations and is summarized in the table below. During the three months ended March 31, 2019, the Company recorded an additional $8.4 million of share-based compensation expense related to the acceleration of vesting that occurred as part of the restructuring program, of which $1.5 million was recorded in "Net gain (loss) from asset sales, inclusive of restructuring costs" on the Condensed Consolidated Statement of Operations and the remaining $6.9 million is included in the table below. During the three months ended March 31, 2018, the Company recorded an additional $2.8 million of share-based compensation expense, related to the acceleration of vesting that occurred as part of the restructuring program, all of which is included in the table below. Refer to Note 9 – Restructuring for additional information.
 
Three Months Ended
 
March 31,
 
2019
 
2018
 
(in millions)
Stock options
$
0.3

 
$
0.5

Restricted share awards
6.1

 
8.8

Performance share units
5.2

 
1.9

Restricted share units
0.1

 
—

Total share-based compensation expense
$
11.7

 
$
11.2
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, 2018
2,098,933

 
$
22.27

 
 
 
 
Cancelled
(283,029
)
 
30.90

 
 
 
 
Outstanding at March 31, 2019
1,815,904

 
$
20.93

 
3.05
 
$
—

Options Exercisable at March 31, 2019
1,754,713

 
$
21.10

 
2.98
 
$
—

Unvested Options at March 31, 2019
61,191

 
$
16.03

 
4.93
 
$
—
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, 2018
3,822,133

 
$
10.76

Granted
2,178,950

 
7.98

Vested
(2,052,013
)
 
11.13

Forfeited
(73,925
)
 
9.40

Unvested balance at March 31, 2019
3,875,145

 
$
9.03

Transactions involving restricted share units under the terms of the LTSIP and LTIP are summarized below:
 
Restricted Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2018
42,675

 
$
10.47

Granted
37,224

 
7.93

Vested
(19,039
)
 
10.67

Unvested balance at March 31, 2019
60,860

 
$
8.85
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, 2018
1,559,312

 
$
11.47

Granted
589,412

 
7.93

Vested
(1,075,334
)
 
10.70

Unvested balance at March 31, 2019
1,073,390

 
$
9.73