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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Share-based Compensation Expense [Table Text Block]
 
Year Ended
 
December 31,
 
2016
 
2015
 
2014
 
(in millions)
Stock options
$
2.3

 
$
2.9

 
$
3.3

Restricted share awards
23.7

 
25.6

 
18.1

Performance share units
9.4

 
6.2

 
0.7

Restricted share units
0.2

 
—

 
—

Total share-based compensation expense
$
35.6

 
$
34.7

 
$
22.1
Schedule of calculated fair value of options granted and major assumptions used [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:
 
Stock Option Assumptions
 
Year Ended December 31,
 
2016
 
2015
 
2014
Weighted-average grant date fair value of awards granted during the period
$
3.77

 
$
6.82

 
$
10.11

Risk-free interest rate range
0.99% - 1.15%

 
1.38% - 1.38%

 
1.31% - 1.34%

Weighted-average risk-free interest rate
1.2
%
 
1.4
%
 
1.3
%
Expected price volatility range
43.42% - 43.66%

 
36.8% - 36.8%

 
36.1% - 37.3%

Weighted-average expected price volatility
43.4
%
 
36.8
%
 
37.1
%
Expected dividend yield
—
%
 
0.37
%
 
0.25
%
Expected term in years at the date of grant
4.5

 
4.5

 
4.5
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 December 31, 2016
2,151,957

 
$
25.26

 
3.66
 
$
3.6

Options Exercisable at December 31, 2016
1,385,753

 
$
30.18

 
2.61
 
$
0.1

Unvested Options at December 31, 2016
766,204

 
$
16.38

 
5.57
 
$
3.5
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, 2015
2,008,210

 
$
24.18

Granted
2,467,954

 
10.50

Vested
(973,307
)
 
25.01

Forfeited
(294,354
)
 
14.26

Unvested balance at December 31, 2016
3,208,503

 
$
14.32
Performance Share Units Activity [Table Text Block]
 
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 out
(178,169
)
 
30.07

Forfeited
(22,522
)
 
15.16

Unvested balance at December 31, 2016
1,027,280

 
$
17.24
Restricted Share Units Activity [Table Text Block]
Transactions involving restricted share units under the terms of the LTSIP are summarized below:
 
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 December 31, 2016
18,034

 
$
10.12