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Postretirement Benefit Plans (Tables) - Postretirement Benefit Plans [Member]
 12 Months Ended
Dec. 31, 2015
Post Retirement Benefit Plans  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
The following tables set forth the change in benefit obligation, change in plan assets, funded status and amounts recognized on the Consolidated Balance Sheets of the postretirement benefit plans as of December 31, 2015 and 2014:
  
2015
2014
Change in benefit obligation:
 
 
Benefit obligation at beginning of year
$
284.6

$
515.6

Service cost
0.4

1.3

Interest cost
10.9

16.7

Actuarial (gains) losses
(7.7
)
18.0

International plan exchange rate change
(0.3
)
(0.1
)
Benefits paid
(26.3
)
(37.1
)
Spinoff of TimkenSteel
—

(229.8
)
 Acquisition
1.1

—

Benefit obligation at end of year
$
262.7

$
284.6
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:
  
2015
2014
2013
Components of net periodic benefit cost:
 
 
 
Service cost
$
0.4

$
1.3

$
2.9

Interest cost
10.9

16.7

21.7

Expected return on plan assets
(7.1
)
(8.5
)
(11.1
)
Amortization of prior service credit
0.8

1.0

(0.2
)
Amortization of net actuarial loss
0.1

—

2.3

Less: discontinued operations
—

(3.1
)
(6.4
)
Net periodic benefit cost
$
5.1

$
7.4

$
9.2
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
$
(14.4
)
$
(22.1
)
Non-current liabilities
(136.1
)
(141.8
)
 
$
(150.5
)
$
(163.9
)
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
$
19.2

$
18.5

Net prior service cost
2.1

3.0

Accumulated other comprehensive loss
$
21.3

$
21.5

Changes in plan assets and benefit obligations recognized in AOCL:
 
 
AOCL at beginning of year
$
21.5

$
13.3

Net actuarial loss
0.7

14.3

Recognized net actuarial loss
(0.1
)
—

Recognized prior service credit
(0.8
)
(1.0
)
Spinoff of TimkenSteel
—

(5.1
)
Total recognized in accumulated other comprehensive loss at December 31
$
21.3

$
21.5
Target assets allocation and actual asset allocations for US pension plan assets
  
Current Target
Allocation
Percentage of VEBA Assets
at December 31,
Asset Category
 
 
 
2015
2014
Equity securities
34%
to
46%
42%
51%
Debt securities
54%
to
66%
58%
49%
Total
 
 
 
100%
100%
Employer contributions to defined postretirement benefit plans
2014
$
20.0

2015
—

2016 (planned)
—
Future pension benefit payments
 
Gross
Expected
Medicare
Subsidies
Net Including
Medicare
Subsidies
2016
$
29.0

$
1.7

$
27.3

2017
27.7

1.7

26.0

2018
26.5

1.7

24.8

2019
25.1

1.7

23.4

2020
23.7

1.7

22.0

2021-2025
101.4

7.8

93.6
Schedule of Assumptions Used [Table Text Block]
Assumptions:
2015
2014
2013
Discount rate
3.95
%
4.33% / 4.59%

3.80
%
Rate of return
6.25
%
5.00
%
5.00
%
Assumptions:
2015
2014
Discount rate
4.39
%
3.95
%
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
  
2015
2014
Change in plan assets:
 
 
Fair value of plan assets at beginning of year
$
120.7

$
240.1

Company contributions / payments
19.0

49.4

Return on plan assets
(1.3
)
12.2

Benefits paid
(26.3
)
(37.1
)
Spinoff of TimkenSteel
—

(143.9
)
Fair value of plan assets at end of year
112.1

120.7

Funded status at end of year
$
(150.5
)
$
(163.9
)
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following table presents the fair value hierarchy for those investments of the Company’s VEBA trust assets measured at fair value on a recurring basis as of December 31, 2015:
 
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
3.0

$
—

$
3.0

$
—

Common collective fund - U.S. equities
28.2

—

28.2

—

Common collective fund - international equities
18.3

—

18.3

—

Common collective fund - fixed income
62.6

—

62.6

—

Total Assets
$
112.1

$
—

$
112.1

$
—

The following table presents the fair value hierarchy for those investments of the Company’s VEBA trust assets measured at fair value on a recurring basis as of December 31, 2014:
 
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
7.9

$
—

$
7.9

$
—

Common collective fund - U.S. equities
39.9

—

39.9

—

Common collective fund - international equities
22.1

—

22.1

—

Common collective fund - fixed income
50.8

—

50.8

—

Total Assets
$
120.7

$
—

$
120.7

$
—