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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 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
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Stock options
$
0.5

 
$
0.7

 
$
1.2

 
$
1.5

Restricted share awards
5.7

 
6.4

 
12.2

 
12.7

Performance share units
4.8

 
(0.6
)
 
5.6

 
1.4

Restricted share units
0.1

 
—

 
0.1

 
—

Total share-based compensation expense
$
11.1

 
$
6.5

 
$
19.1

 
$
15.6
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 six months ended June 30, 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
(486,999
)
 
23.77

 
 
 
 
Outstanding at June 30, 2016
2,150,503

 
$
25.27

 
4.17
 
$
3.3

Options Exercisable at June 30, 2016
1,348,779

 
$
30.52

 
3.03
 
$
—

Unvested Options at June 30, 2016
801,724

 
$
16.43

 
6.07
 
$
3.3
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
2,390,046

 
10.25

Vested
(829,128
)
 
25.79

Forfeited
(201,802
)
 
14.27

Unvested balance at June 30, 2016
3,367,326

 
$
14.49

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

 
$
—

Granted
21,493

 
10.12

Vested
(193
)
 
10.12

Forfeited
(3,266
)
 
10.12

Unvested balance at June 30, 2016
18,034

 
$
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
(3,942
)
 
28.42

Unvested balance at June 30, 2016
1,042,920

 
$
17.15