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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
 
2017
 
2016
 
(in millions)
Stock options
$
0.6

 
$
0.7

Restricted share awards
7.3

 
6.5

Performance share units
(1.9
)
 
0.8

Restricted share units
—

 
—

Total share-based compensation expense
$
6.0

 
$
8.0
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, 2017:
 
Stock Option Assumptions
Weighted-average grant date fair value of awards granted during the period
$
6.52

Weighted-average risk-free interest rate
1.81
%
Weighted-average expected price volatility
43.8
%
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
409,549

 
16.98

 
 
 
 
Canceled
(202,260
)
 
27.55

 
 
 
 
Outstanding at March 31, 2017
2,359,246

 
$
23.63

 
4.32
 
$
1.1

Options Exercisable at March 31, 2017
1,535,515

 
$
28.04

 
3.30
 
$
0.4

Unvested Options at March 31, 2017
823,731

 
$
15.42

 
6.22
 
$
0.7
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
1,443,185

 
17.02

Vested
(1,235,330
)
 
16.42

Forfeited
(41,240
)
 
14.78

Unvested balance at March 31, 2017
3,375,118

 
$
14.70

 
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 March 31, 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
401,480

 
16.98

Vested and Paid
(215,439
)
 
31.63

Unvested balance at March 31, 2017
1,213,321

 
$
14.60