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Postretirement Benefit Plans (Tables) - Postretirement Benefit Plans [Member]
 12 Months Ended
Dec. 31, 2016
Post Retirement Benefit Plans  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
  
2016
2015
Change in benefit obligation:
 
 
Benefit obligation at beginning of year
$
262.7

$
284.6

Service cost
0.3

0.4

Interest cost
11.0

10.9

Amendments
(11.4
)
—

Actuarial (gains) losses
4.3

(7.7
)
International plan exchange rate change
—

(0.3
)
Benefits paid
(25.5
)
(26.3
)
 Acquisition
—

1.1

Benefit obligation at end of year
$
241.4

$
262.7
Schedule of Defined Benefit Plans Disclosures [Table Text Block] The following tables summarize the net periodic benefit cost information and the related assumptions used to measure the net periodic benefit cost for the years ended December 31:
 
2016
2015
2014
Components of net periodic benefit cost:
 
 
 
Service cost
$
0.3

$
0.4

$
1.3

Interest cost
11.0

10.9

16.7

Expected return on plan assets
(6.6
)
(7.1
)
(8.5
)
Amortization of prior service credit
1.0

0.8

1.0

Amortization of net actuarial loss
—

0.1

—

Curtailment
0.1

—

—

Less: discontinued operations
—

—

(3.1
)
Net periodic benefit cost
$
5.8

$
5.1

$
7.4
Defined Benefit and postretirement benefit for Change in Plan Assets Amounts recognized on the Consolidated Balance Sheets
Amounts recognized on the Consolidated Balance Sheets:
 
 
Current liabilities
$
(7.5
)
$
(14.5
)
Non-current liabilities
(131.5
)
(136.1
)
 
$
(139.0
)
$
(150.6
)
Defined Benefit and postretirement benefit for Change in Plan Assets Amounts recognized in accumulated other Comprehensive income
Amounts recognized in accumulated other comprehensive loss:
 
 
Net actuarial loss
$
23.9

$
19.2

Net prior service cost
(10.3
)
2.1

Accumulated other comprehensive loss
$
13.6

$
21.3

Changes in plan assets and benefit obligations recognized in AOCL:
 
 
AOCL at beginning of year
$
21.3

$
21.5

Net actuarial loss
4.8

0.7

Prior service cost
(11.4
)
—

Recognized net actuarial loss
—

(0.1
)
Recognized prior service credit
(1.0
)
(0.8
)
Loss recognized due to curtailment
(0.1
)
—

Total recognized in accumulated other comprehensive loss at December 31
$
13.6

$
21.3
Target assets allocation and actual asset allocations for US pension plan assets
 
Current Target
Allocation
Percentage of VEBA Assets
at December 31,
Asset Category
 
 
 
2016
2015
Equity securities
34%
to
46%
30%
42%
Debt securities
54%
to
66%
70%
58%
Total
 
 
 
100%
100%
Future pension benefit payments Future benefit payments are expected to be as follows:
 
Gross
Expected
Medicare
Subsidies
Net Including
Medicare
Subsidies
2017
$
27.7

$
1.7

$
26.0

2018
26.3

1.8

24.5

2019
24.7

1.8

22.9

2020
23.2

1.9

21.3

2021
21.8

1.9

19.9

2022-2026
91.4

8.6

82.8
Schedule of Assumptions Used [Table Text Block]
Assumptions:
2016
2015
Discount rate
3.97
%
4.39
%
Assumptions:
2016
2015
2014
Discount rate
4.39
%
3.95
%
4.33% / 4.59%

Rate of return
6.00
%
6.25
%
5.00
%
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
  
2016
2015
Change in plan assets:
 
 
Fair value of plan assets at beginning of year
$
112.1

$
120.7

Company contributions / payments
9.7

19.0

Return on plan assets
6.1

(1.3
)
Benefits paid
(25.5
)
(26.3
)
Fair value of plan assets at end of year
102.4

112.1

Funded status at end of year
$
(139.0
)
$
(150.6
)
Fair Value, Assets Measured on Recurring Basis [Table Text Block] The following table presents those investments of the Company’s VEBA trust assets measured at net asset value on a recurring basis as of December 31, 2016 and 2015, respectively:
 
2016
2015
Assets:
 
 
Cash and cash equivalents
$
2.1

$
3.0

Common collective fund - U.S. equities
18.5

28.2

Common collective fund - international equities
12.3

18.3

Common collective fund - fixed income
69.5

62.6

Total Assets
$
102.4

$
112.1