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Employee Benefit Plans Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Assumptions Used [Table Text Block]

 
Pension Benefits
 
OPEB
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
U.S.
 
U.K
 
U.S.
 
U.K
 
U.S.
 
U.K.
 
 
 
 
 
 
Discount rate
4.40
%
 
3.90
%
 
4.10
%
 
3.70
%
 
5.00
%
 
4.50
%
 
4.45
%
 
4.15
%
 
4.95
%
Expected return on plan assets
7.50
%
 
5.00
%
 
7.50
%
 
5.00
%
 
7.50
%
 
5.15
%
 
N/A

 
N/A

 
N/A

Rate of compensation increase
4.00
%
 
3.30
%
 
4.00
%
 
3.30
%
 
4.00
%
 
3.60
%
 
4.00
%
 
4.00
%
 
4.00
%
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
 
Pension Benefits
 
OPEB
 
December 31,
 
December 31,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Change in benefit obligation
 
 
 
 
 
 
 
Benefit obligation at beginning of year
$
738.8

 
$
755.4

 
$
654.7

 
$
577.9

Service cost
3.2

 
3.5

 
0.4

 
0.3

Interest cost
28.6

 
36.1

 
15.0

 
15.3

Actuarial loss (gain)
(32.1
)
 
119.3

 
(35.9
)
 
41.2

Change in GM portion of OPEB obligation
—

 
—

 
(31.6
)
 
31.8

Participant contributions
0.4

 
0.4

 
—

 
—

Settlements
—

 
(131.1
)
 
—

 
—

Benefit payments
(38.4
)
 
(36.5
)
 
(14.2
)
 
(11.8
)
Currency fluctuations
(7.4
)
 
(8.3
)
 
—

 
—

Net change
(45.7
)
 
(16.6
)
 
(66.3
)
 
76.8

Benefit obligation at end of year
$
693.1

 
$
738.8

 
$
588.4

 
$
654.7

 
 
 
 
 
 
 
 
Change in plan assets
 
 
 
 
 
 
 
Fair value of plan assets at beginning of year
$
643.7

 
$
713.4

 
$
—

 
$
—

Actual return on plan assets
(5.0
)
 
77.2

 
—

 
—

Employer contributions
20.1

 
1.9

 
14.2

 
11.8

Participant contributions
0.4

 
0.4

 
—

 
—

Benefit payments
(38.4
)
 
(36.5
)
 
(14.2
)
 
(11.8
)
Settlements
—

 
(104.2
)
 
—

 
—

Currency fluctuations
(8.0
)
 
(8.5
)
 
—

 
—

Net change
(30.9
)
 
(69.7
)
 
—

 
—

Fair value of plan assets at end of year
$
612.8

 
$
643.7

 
$
—

 
$
—
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

 
Pension Benefits
 
OPEB
 
December 31,
 
December 31,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Noncurrent assets
$
27.0

 
$
6.9

 
$
—

 
$
—

Current liabilities
(4.2
)
 
(3.0
)
 
(29.4
)
 
(29.6
)
Noncurrent liabilities
(103.1
)
 
(99.0
)
 
(559.0
)
 
(625.1
)
Net liability
$
(80.3
)
 
$
(95.1
)
 
$
(588.4
)
 
$
(654.7
)
Schedule of Pre-tax Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

 
Pension Benefits
 
OPEB
 
December 31,
 
December 31,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Net actuarial gain (loss)
$
(222.9
)
 
$
(215.3
)
 
$
1.1

 
$
(35.7
)
Net prior service credit
0.6

 
0.7

 
12.7

 
15.4

Total amounts recorded
$
(222.3
)
 
$
(214.6
)
 
$
13.8

 
$
(20.3
)
Schedule of Net Benefit Costs [Table Text Block]

 
Pension Benefits
 
OPEB
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
(in millions)
Service cost
$
3.2

 
$
3.5

 
$
3.4

 
$
0.4

 
$
0.3

 
$
0.4

Interest cost
28.6

 
36.1

 
33.8

 
15.0

 
15.3

 
13.2

Expected asset return
(42.0
)
 
(48.4
)
 
(45.8
)
 
—

 
—

 
—

Amortized actuarial loss
6.0

 
5.4

 
8.9

 
0.8

 
0.5

 
0.9

Amortized prior service cost (credit)
(0.1
)
 
(0.1
)
 
5.4

 
(2.7
)
 
(2.7
)
 
(1.8
)
Settlement charge
—

 
35.5

 
—

 
—

 
—

 
—

Net periodic benefit cost (credit)
$
(4.3
)
 
$
32.0

 
$
5.7

 
$
13.5

 
$
13.4

 
$
12.7
Schedule of Allocation of Plan Assets [Table Text Block]
The fair values of our pension plan assets are as follows:
December 31, 2015
 
 
 
 
 
 
 
 
Asset Categories
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
(in millions)
Cash & Cash Equivalents
 
$
23.7

 
$
—

 
$
—

 
$
23.7

Equity
 
 
 
 
 
 
 
 
    U.S. Large Cap
 
77.1

 
—

 
—

 
77.1

    U.S. Small/Mid Cap
 
28.2

 
—

 
—

 
28.2

    World Equity
 
95.5

 
—

 
—

 
95.5

Fixed Income Securities
 
 
 
 
 
 
 
 
    Government & Agencies
 
68.1

 
35.8

 
—

 
103.9

    Corporate Bonds - Investment Grade
 
138.4

 
—

 
—

 
138.4

    Corporate Bonds - Non-investment Grade
 
24.8

 
—

 
—

 
24.8

    Emerging Market Debt
 
18.1

 
—

 
—

 
18.1

    Other
 
6.9

 
—

 
—

 
6.9

Hedge Funds
 
 
 
 
 
 
 
 
    Property Funds
 
—

 
—

 
54.6

 
54.6

    Multi Strategy Hedge Fund
 
—

 
—

 
41.6

 
41.6

Total Plan Assets
 
$
480.8

 
$
35.8

 
$
96.2

 
$
612.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
 
Asset Categories
 
Level 1
 
Level 2
 
Level 3
 
Total
 
 
(in millions)
Cash & Cash Equivalents
 
$
6.7

 
$
—

 
$
—

 
$
6.7

Equity
 
 
 
 
 
 
 
 
    U.S. Large Cap
 
87.3

 
—

 
—

 
87.3

    U.S. Small/Mid Cap
 
25.2

 
—

 
—

 
25.2

    World Equity
 
94.2

 
—

 
—

 
94.2

Fixed Income Securities
 
 
 
 
 
 
 
 
    Government & Agencies
 
67.9

 
58.8

 
—

 
126.7

    Corporate Bonds - Investment Grade
 
139.9

 
—

 
—

 
139.9

    Corporate Bonds - Non-investment Grade
 
31.9

 
—

 
—

 
31.9

    Emerging Market Debt
 
19.0

 
—

 
—

 
19.0

    Other
 
7.2

 
—

 
—

 
7.2

Hedge Funds
 
 
 
 
 
 
 
 
    Property Funds
 
—

 
—

 
48.3

 
48.3

    Multi Strategy Hedge Fund
 
—

 
—

 
57.3

 
57.3

Total Plan Assets
 
$
479.3

 
$
58.8

 
$
105.6

 
$
643.7

 
U.S.
 
U.K.
 
 
 
Target
 
 
 
Target
 
2015
 
2014
 
Allocation
 
2015
 
2014
 
Allocation
Equity securities
34.8
%
 
33.1
%
 
30% - 65%
 
26.7
%
 
28.7
%
 
25% - 35%
Fixed income securities
46.2

 
47.3

 
35% - 55%
 
52.0

 
61.1

 
55% - 65%
Hedge funds
17.8

 
18.3

 
0% - 20%
 
9.6

 
10.1

 
5% - 15%
Cash
1.2

 
1.3

 
0% - 5%
 
11.7

 
0.1

 
0% - 5%
Total
100.0
%
 
100.0
%
 
 
 
100.0
%
 
100.0
%
 
 
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
 
December 31,
 
2015
 
2014
 
(in millions)
Beginning balance
$
105.6

 
$
64.5

Actual return on plan assets:
 
 
 
Relating to assets still held at the reporting date
3.8

 
3.3

Purchases, sales and settlements, net
(13.2
)
 
37.8

Ending balance
$
96.2

 
$
105.6