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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Stock options
$
0.5

 
$
0.6

 
$
1.7

 
$
1.8

Restricted share awards
5.4

 
6.0

 
18.7

 
18.2

Performance share units
(0.1
)
 
3.2

 
(6.9
)
 
8.8

Restricted share units
—

 
0.1

 
—

 
0.2

Total share-based compensation expense
$
5.8

 
$
9.9

 
$
13.5

 
$
29.0
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The calculated fair value of stock options granted and major assumptions used in the model at the date of grant are listed below for the nine months ended September 30, 2017:
 
Stock Option Assumptions
Weighted-average grant date fair value of awards granted during the period
$
6.44

Weighted-average risk-free interest rate
1.81
%
Weighted-average expected price volatility
43.9
%
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, 2016
2,151,957

 
$
25.26

 
 
 
 
Granted
418,752

 
16.77

 
 
 
 
Forfeited
(14,172
)
 
15.33

 
 
 
 
Canceled
(202,260
)
 
27.55

 
 
 
 
Outstanding at September 30, 2017
2,354,277

 
$
23.62

 
3.75
 
$
—

Options Exercisable at September 30, 2017
1,551,861

 
$
27.90

 
2.73
 
$
—

Unvested Options at September 30, 2017
802,416

 
$
15.33

 
5.73
 
$
—
Schedule of Share-based Compensation, Restricted Share Awards Activity [Table Text Block]
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, 2016
3,208,503

 
$
14.32

Granted
2,123,016

 
14.13

Vested
(1,384,011
)
 
16.54

Forfeited
(240,732
)
 
14.71

Unvested balance at September 30, 2017
3,706,776

 
$
13.35

 
Restricted Share Units Outstanding
 
Weighted-Average Grant Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2016
18,034

 
$
10.12

Granted
9,924

 
16.98

Vested
(6,012
)
 
10.12

Unvested balance at September 30, 2017
21,946

 
$
13.22
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, 2016
1,027,280

 
$
17.24

Granted
405,014

 
16.90

Vested and Paid
(215,439
)
 
31.63

Forfeited
(17,519
)
 
13.88

Unvested balance at September 30, 2017
1,199,336

 
$
14.59