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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
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:
 
Three Months Ended
 
March 31,
 
2016
 
2015
 
(in millions)
Stock options
$
0.7

 
$
0.8

Restricted share awards
6.5

 
6.3

Performance share units
0.8

 
2.0

Restricted share units
—

 
—

Total share-based compensation expense
$
8.0

 
$
9.1
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The calculated fair value of options granted and major assumptions used in the model at the date of grant are listed below for the three months ended March 31, 2016:
 
Stock Option Assumptions
Weighted-average grant date fair value of awards granted during the period
$
3.76

Weighted-average risk-free interest rate
1.15
%
Weighted-average expected price volatility
43.4
%
Expected dividend yield
—
%
Expected term in years at the date of grant
4.5
Schedule of 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, 2015
2,200,776

 
$
27.94

 
 
 
 
Granted
436,726

 
10.12

 
 
 
 
Canceled
(386,999
)
 
23.98

 
 
 
 
Outstanding at March 31, 2016
2,250,503

 
$
25.17

 
4.22
 
$
1.7

Options Exercisable at March 31, 2016
1,448,779

 
$
30.00

 
3.06
 
$
—

Unvested Options at March 31, 2016
801,724

 
$
16.43

 
6.32
 
$
1.7
Schedule of Share-based Compensation, Restricted Share Awards Activity [Table Text Block]
Transactions involving restricted shares under the terms of the LTSIP are summarized below:
 
Restricted Shares
Outstanding
 
Weighted-
Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2015
2,008,210

 
$
24.18

Granted
2,356,919

 
10.13

Vested
(783,782
)
 
26.01

Forfeited
(41,193
)
 
18.32

Unvested balance at March 31, 2016
3,540,154

 
$
14.50

 
Restricted Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
Unvested balance at December 31, 2015
—

 
$
—

Granted
21,493

 
10.12

Unvested balance at March 31, 2016
21,493

 
$
10.12
Schedule of Share-based Compensation, Restricted Share Units Activity [Table Text Block]
Transactions involving restricted shares under the terms of the LTSIP are summarized below:
 
Restricted Shares
Outstanding
 
Weighted-
Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2015
2,008,210

 
$
24.18

Granted
2,356,919

 
10.13

Vested
(783,782
)
 
26.01

Forfeited
(41,193
)
 
18.32

Unvested balance at March 31, 2016
3,540,154

 
$
14.50

 
Restricted Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
Unvested balance at December 31, 2015
—

 
$
—

Granted
21,493

 
10.12

Unvested balance at March 31, 2016
21,493

 
$
10.12
Schedule of Other Share-based Compensation, Activity [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
Unvested balance at December 31, 2015
630,786

 
$
27.50

Granted
594,245

 
10.12

Vested and Paid
(178,169
)
 
30.07

Forfeited
(3,024
)
 
27.39

Unvested balance at March 31, 2016
1,043,838

 
$
17.17