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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Stock options
$
0.6

 
$
0.7

 
$
1.8

 
$
2.2

Restricted share awards
6.0

 
6.8

 
18.2

 
19.5

Performance share units
3.2

 
0.2

 
8.8

 
1.6

Restricted share units
0.1

 
—

 
0.2

 
—

Total share-based compensation expense
$
9.9

 
$
7.7

 
$
29.0

 
$
23.3
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 nine months ended September 30, 2016:
 
Stock Option Assumptions
Weighted-average grant date fair value of awards granted during the period
$
3.77

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
438,180

 
10.14

 
 
 
 
Canceled
(486,999
)
 
23.77

 
 
 
 
Outstanding at September 30, 2016
2,151,957

 
$
25.26

 
3.92
 
$
4.1

Options Exercisable at September 30, 2016
1,385,753

 
$
30.18

 
2.86
 
$
0.2

Unvested Options at September 30, 2016
766,204

 
$
16.38

 
5.83
 
$
3.9
Schedule of Share-based Compensation, Restricted Share Awards Activity [Table Text Block]
 
Restricted Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2015
—

 
$
—

Granted
21,493

 
10.12

Vested
(193
)
 
10.12

Forfeited
(3,266
)
 
10.12

Unvested balance at September 30, 2016
18,034

 
$
10.12

Transactions involving restricted share awards under the terms of the LTSIP are summarized below:
 
Restricted Share Awards Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2015
2,008,210

 
$
24.18

Granted
2,427,634

 
10.37

Vested
(966,748
)
 
25.03

Forfeited
(252,448
)
 
14.16

Unvested balance at September 30, 2016
3,216,648

 
$
14.29
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
 
 
 
(per share)
Unvested balance at December 31, 2015
630,786

 
$
27.50

Granted
597,185

 
10.16

Vested and Paid
(178,169
)
 
30.07

Forfeited
(22,431
)
 
15.09

Unvested balance at September 30, 2016
1,027,371

 
$
17.24