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Retirement Plans and Post Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Net Funded Status and Assumptions Used in Calculating Benefit Obligation [Table Text Block]
The projected benefit obligation is the actuarial present value of benefits attributable to employee service rendered to date, including the effects of estimated salary increases. The following table details information regarding our pension plans at December 31:
Dollar amounts in millions
2018
 
2017
Change in benefit obligation:
 
 
 
Beginning of year balance
$
345.5

 
$
331.9

Service cost
2.6

 
4.9

Interest cost
11.1

 
12.5

Actuarial loss
(24.5
)
 
10.8

Curtailment
(1.3
)
 
—

Foreign exchange rate changes
(4.5
)
 
3.6

Benefits paid
(32.2
)
 
(18.2
)
End of year balance
$
296.7

 
$
345.5

Change in assets (fair value):
 
 
 
Beginning of year balance
$
265.9

 
$
239.9

Actual return on plan assets
(7.3
)
 
27.8

Employer contribution
52.9

 
12.7

Foreign exchange rate changes
(4.5
)
 
3.7

Benefits paid
(32.2
)
 
(18.2
)
End of year balance
$
274.8

 
$
265.9

Funded status:
 
 
 
Plan assets (less than) over benefit obligations:
$
(21.9
)
 
$
(79.6
)
 
 
 
 
Amounts included in the balance sheet:
 
 
 
Noncurrent pension assets, included in “Other assets”
$
4.5

 
$
1.4

Current pension liabilities, included in “Accounts payable and accrued liabilities”
(3.1
)
 
(12.1
)
Noncurrent pension liabilities, included in “Other long-term liabilities”
(23.3
)
 
(68.9
)
Net amount recognized
$
(21.9
)
 
$
(79.6
)
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
The pretax amounts recognized in Accumulated other comprehensive loss were as follows:
Dollar amounts in millions
Actuarial losses
 
Prior service cost
 
Total
December 31, 2016
$
(140.6
)
 
$
(8.4
)
 
$
(149.0
)
Other comprehensive income (loss) before reclassifications
3.2

 
—

 
3.2

Amounts reclassified from accumulated comprehensive loss
9.3

 
0.5

 
9.8

December 31, 2017
(128.1
)
 
(7.9
)
 
(136.0
)
Other comprehensive income (loss) before reclassifications
4.1

 
—

 
4.1

Amounts reclassified from accumulated comprehensive loss
7.6

 
0.5

 
8.1

December 31, 2018
$
(116.4
)
 
$
(7.4
)
 
$
(123.8
)
Schedule of Assumptions Used [Table Text Block]
Weighted-average assumptions used to calculate our benefit obligations at December 31:
 
2018
 
2017
Discount rate:
 
 
 
US
4.2
%
 
3.5
%
Canada
3.8
%
 
3.3
%
SERP
NA

 
2.9
%
Rate of compensation increase:
 
 
 
US
NA

 
NA

Canada
3.5
%
 
3.5
%
SERP
NA

 
3.0
%
Schedule of benefit obligation by plan category [Table Text Block]
Benefit obligations by plan category are as follows:
 
2018
Dollar amounts in millions
US
 
Canada
 
SERP
 
Total
Fair value of plan assets
$
222.4

 
$
52.4

 
$
—

 
$
274.8

Benefit obligation
244.8

 
49.0

 
2.9

 
296.7

Funded Status
$
(22.4
)
 
$
3.4

 
$
(2.9
)
 
$
(21.9
)
 
 
 
 
 
 
 
 
 
2017
 
US
 
Canada
 
SERP
 
Total
Fair value of plan assets
$
207.7

 
$
58.2

 
$
—

 
$
265.9

Benefit obligation
272.6

 
58.1

 
14.8

 
345.5

Funded Status
$
(64.9
)
 
$
0.1

 
$
(14.8
)
 
$
(79.6
)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The amount of accumulated other comprehensive income that is expected to be amortized as expense during 2019 is:
 
Dollar amounts in millions
 
Net actuarial loss
$
4.7

Prior service cost
0.5

Total
$
5.2
Schedule of Expected Benefit Payments [Table Text Block]
The benefits expected to be paid from the benefit plans, which reflect expected future service, are as follows:
 
Dollar amounts in millions
 
Year
 
2019
$
22.4

2020
20.3

2021
20.4

2022
19.6

2023
20.1

2024– 2028
96.6
Schedule of Net Benefit Costs [Table Text Block]
The following table sets forth the net periodic pension cost for our defined benefit pension plans. The components of our net periodic pension costs consisted of the following: 
 
Year ended December 31,
Dollar amounts in millions
2018
 
2017
 
2016
Service cost
$
2.6

 
$
4.9

 
$
4.3

Other components of net periodic pension cost:
 
 
 
 
 
Interest cost
11.1

 
12.5

 
13.1

Expected return on plan assets
(13.9
)
 
(13.1
)
 
(13.1
)
Amortization of prior service cost and net transition asset
0.5

 
0.5

 
0.5

Amortization of net actuarial loss
6.3

 
6.2

 
5.4

Net periodic pension cost before loss due to settlement
$
6.6

 
$
11.0

 
$
10.2

Loss due to settlement
0.1

 
3.1

 
—

 
$
6.7

 
$
14.1

 
$
10.2

 
 
 
 
 
 
Net periodic pension cost included in cost of sales
$
1.6

 
$
3.6

 
$
3.2

Net periodic pension cost included in selling, general, and administrative expenses
1.0

 
1.3

 
1.1

Net periodic pension cost included in other non-operating items
4.1

 
9.2

 
5.9

 
$
6.7

 
$
14.1

 
$
10.2










Weighted-average assumptions used to calculate our net periodic pension costs for the year ended December 31:
 
2018
 
2017
 
2016
Discount rate:
 
 
 
 
 
U.S.
3.5
%
 
4.0
%
 
4.2
%
Canada
3.3
%
 
3.7
%
 
3.8
%
SERP
NA

 
2.7
%
 
2.8
%
Expected return on plan assets:
 
 
 
 
 
U.S.
5.8
%
 
5.8
%
 
5.8
%
Canada
4.1
%
 
3.8
%
 
3.8
%
SERP
NA

 
NA

 
NA

Rate of compensation increase:
 
 
 
 
 
U.S.
NA

 
NA

 
NA

Canada
3.5
%
 
3.5
%
 
3.5
%
SERP
NA

 
3.0
%
 
3.0
%
Schedule of Allocation of Plan Assets [Table Text Block]
The actual and target allocations at the measurement dates are as follows:  
 
Target
Allocation
2018
 
Actual
Allocation
2018
 
2017
Asset category
 
 
 
 
 
U.S. Plans
 
 
 
 
 
Equity securities
33
%
 
26
%
 
40
%
Debt securities
50
%
 
52
%
 
20
%
Multi-Strategy Funds
17
%
 
22
%
 
40
%
Total Allocation for U.S. Plans
100
%
 
100
%
 
100
%
 
 
 
 
 
 
Non-U.S. Plans
 
 
 
 
 
Equity securities
—
%
 
—
%
 
28
%
Debt securities
90
%
 
90
%
 
70
%
Multi-Strategy Funds
10
%
 
10
%
 
2
%
Total Allocation for Non-U.S. Plans
100
%
 
100
%
 
100
%
The fair value of our pension plan assets at December 31, 2018 and December 31, 2017, fair value asset categories and the level of inputs as defined in Note 4 are as follows: 
Dollar amounts in millions
Asset Category
December 31, 2018
 
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Equity investment funds:(a)
 
 
 
 
 
 
 
  Domestic stock funds:


 
 
 
 
 
 
Measured within the fair value hierarchy
$
22.3

 
$
22.3

 
$
—

 
$
—

Measured at net asset value (d)
8.3

 
—

 
8.3

 
—

  International stock funds:


 
 
 
 
 
 
Measured within the fair value hierarchy
13.2

 
13.2

 
—

 
—

Measured at net asset value (d)
13.7

 


 
13.7

 


Fixed income investment funds:(b)
 
 
 
 
 
 
 
Domestic bond funds:
 
 
 
 
 
 
 
Measured within the fair value hierarchy
27.1

 
27.1

 
—

 
—

Measured at net asset value (d)
88.5

 
3.9

 
84.6

 


International bond funds:
 
 
 
 
 
 
 
Measured within the fair value hierarchy
27.3

 


 
27.3

 


Measured at net asset value (d)
20.1

 
—

 
20.1

 
—

Multi-strategy funds:(c)
 
 
 
 
 
 
 
Measured within the fair value hierarchy
35.0

 
35.0

 
—

 
—

Measured at net asset value (d)
17.8

 
—

 
5.1

 
12.7

Cash & cash equivalents
1.5

 
—

 
1.5

 
—

Total
$
274.8

 
$
101.5

 
$
160.6

 
$
12.7

  _______________
(a)
Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
(b)
Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
(c)
The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
(d) 
Investments for which fair value is measured using the net asset value per share as a practical expedient are not categorized within the fair value hierarchy.
Dollar amounts in millions
Asset Category
December 31, 2017
 
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Equity investment funds:(a)
 
 
 
 
 
 
 
  Domestic stock funds
$
56.2

 
$
42.2

 
$
14.0

 
$
—

  International stock funds
43.1

 
15.5

 
27.6

 
—

Fixed income investment funds:(b)


 
 
 
 
 
 
  Domestic bond funds
40.2

 
20.2

 
20.0

 
—

  International bond funds
40.9

 
—

 
40.9

 
—

Multi-strategy funds(c)
82.5

 
69.6

 
—

 
12.9

Cash & cash equivalents
3.0

 
—

 
3.0

 
—

Total
$
265.9

 
$
147.5

 
$
105.5

 
$
12.9

 _______________
(a) 
Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
(b) 
Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
(c) 
The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
he following table summarizes assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the period.
 
Dollar amounts in millions
Multi-Strategy
Funds
Balance at January 1, 2017
$
12.2

Total unrealized gains
0.7

Contribution (redemption)
0.1

Management fees
(0.1
)
Balance at December 31, 2017
$
12.9

Total unrealized gains
$
(0.2
)
Contribution (redemption)
0.2

Management fees
(0.2
)
Balance at December 31, 2018
$
12.7