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Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Post Retirement Benefit Plans  
Fair Value, Assets Measured on Recurring Basis [Table Text Block] The following tables present the fair value hierarchy for those assets and liabilities on the Consolidated Balance Sheets measured at fair value on a recurring basis as of December 31, 2017 and 2016:
 
December 31, 2017
  
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
108.5

$
107.3

$
1.2

$
—

Cash and cash equivalents measured at net
asset value
13.1







Restricted cash
3.8

3.8

—

—

Short-term investments
16.2

—

16.2

—

Short-term investments measured at net asset value
0.2







Foreign currency hedges
1.3

—

1.3

—

Total Assets
$
143.1

$
111.1

$
18.7

$
—

 
 
 
 
 
Liabilities:
 
 
 
 
Foreign currency hedges
$
7.1

$
—

$
7.1

$
—

Total Liabilities
$
7.1

$
—

$
7.1

$
—


 
December 31, 2016
  
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
129.6

$
125.0

$
4.6

$
—

Cash and cash equivalents measured at net
asset value
19.2







Restricted cash
2.7

2.7

—

—

Short-term investments
9.4

—

9.4

—

Short-term investments measured at net asset value
2.3







Foreign currency hedges
9.9

—

9.9

—

Total Assets
$
173.1

$
127.7

$
23.9

$
—

 
 
 
 
 
Liabilities:
 
 
 
 
Foreign currency hedges
$
2.1

$
—

$
2.1

$
—

Total Liabilities
$
2.1

$
—

$
2.1

$
—
Postretirement Benefit Plans [Member]  
Post Retirement Benefit Plans  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
  
2017
2016
Change in benefit obligation:
 
 
Benefit obligation at beginning of year
$
241.4

$
262.7

Service cost
0.1

0.3

Interest cost
9.1

11.0

Plan amendments
1.2

(11.4
)
Actuarial (gains) losses
(0.3
)
4.3

Benefits paid
(31.7
)
(25.5
)
Benefit obligation at end of year
$
219.8

$
241.4
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:
 
2017
2016
2015
Components of net periodic benefit cost:
 
 
 
Service cost
$
0.1

$
0.3

$
0.4

Interest cost
9.1

11.0

10.9

Expected return on plan assets
(5.6
)
(6.3
)
(7.3
)
Amortization of prior service (credit) cost
(1.0
)
1.0

0.8

Recognition of net actuarial (gains) losses
(4.0
)
4.5

1.0

Curtailment
—

0.1

—

Net periodic benefit cost
$
(1.4
)
$
10.6

$
5.8
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
$
(4.8
)
$
(7.5
)
Non-current liabilities
(122.6
)
(131.5
)
 
$
(127.4
)
$
(139.0
)
Defined Benefit and postretirement benefit for Change in Plan Assets Amounts recognized in accumulated other Comprehensive income
Amounts recognized in accumulated other comprehensive income:
 
 
Net prior service cost
$
(8.1
)
$
(10.3
)
Accumulated other comprehensive income
$
(8.1
)
$
(10.3
)
Changes to prior service cost recognized in accumulated other comprehensive (income) loss:
 
 
Accumulated other comprehensive income (loss) at beginning of year
$
(10.3
)
$
2.2

Prior service cost (credit)
1.2

(11.4
)
Recognized prior service credit (cost)
1.0

(1.0
)
Loss recognized due to curtailment
—

(0.1
)
Total recognized in accumulated other comprehensive income at December 31
$
(8.1
)
$
(10.3
)
Target assets allocation and actual asset allocations for US pension plan assets
 
Current Target
Allocation
Percentage of VEBA Assets
at December 31,
Asset Category
 
 
 
2017
2016
Equity securities
14%
to
20%
17%
30%
Fixed income securities
80%
to
86%
83%
70%
Total
 
 
 
100%
100%
Future pension benefit payments Future benefit payments are expected to be as follows:
 
Gross
Expected
Medicare
Subsidies
Net Including
Medicare
Subsidies
2018
$
24.9

$
1.2

$
23.7

2019
23.4

1.2

22.2

2020
22.0

1.3

20.7

2021
20.8

1.3

19.5

2022
19.6

1.3

18.3

2023-2027
80.9

6.3

74.6
Schedule of Assumptions Used [Table Text Block] The following table summarizes assumptions used to measure the benefit obligation for the other postretirement benefit plans at December 31:
Assumptions:
2017
2016
Discount rate
3.57
%
3.97
%
Assumptions:
2017
2016
2015
Discount rate
3.97
%
4.39
%
3.95
%
Rate of return
6.00
%
6.00
%
6.25
%
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Change in plan assets:
 
 
Fair value of plan assets at beginning of year
$
102.4

$
112.1

Company contributions / payments
12.4

9.7

Return on plan assets
9.3

6.1

Benefits paid
(31.7
)
(25.5
)
Fair value of plan assets at end of year
92.4

102.4

Funded status at end of year
$
(127.4
)
$
(139.0
)
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, 2017 and 2016, respectively:
 
2017
2016
Assets:
 
 
Cash and cash equivalents
$
13.0

$
2.1

Common collective fund - U.S. equities
9.5

18.5

Common collective fund - international equities
6.7

12.3

Common collective fund - fixed income
63.2

69.5

Total Assets
$
92.4

$
102.4