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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic benefit cost are presented below.
 
2015
 
2014
 
2013
 
(in millions)
Service cost
$
1.9

 
$
1.7

 
$
2.0

Interest cost
20.1

 
19.9

 
18.3

Expected return on plan assets
(24.6
)
 
(23.8
)
 
(25.1
)
Amortization of net loss
3.2

 
3.5

 
9.0

Curtailment / special settlement loss
0.5

 
0.2

 
0.1

Net periodic benefit cost
$
1.1

 
$
1.5

 
$
4.3
Schedule of Accumulated and Projected Benefit Obligations
Balance sheet information for Pension Plans with accumulated benefit obligations in excess of plan assets is presented below.
 
September 30,
 
2015
 
2014
 
(in millions)
Projected benefit obligations
$
427.0

 
$
459.9

Accumulated benefit obligations
427.0

 
459.9

Fair value of plan assets
381.3

 
407.6

Balance sheet information for Pension Plans with accumulated benefit obligations less than plan assets is presented below.
 
September 30,
 
2015
 
2014
 
(in millions)
Projected benefit obligations
$
1.2

 
$
1.6

Accumulated benefit obligations
1.2

 
1.6

Fair value of plan assets
2.1

 
2.9
Schedule Of Defined Benefit Plans Disclosures
Amounts recognized for our Pension Plans and other postretirement benefit plans are presented below.
 
Pension Plans
 
2015
 
2014
 
(in millions)
Projected benefit obligations:
 
 
 
Beginning of year
$
461.5

 
$
399.6

Service cost
1.9

 
1.7

Interest cost
20.1

 
19.9

Actuarial loss (gain)
(25.9
)
 
67.3

Benefits paid
(26.0
)
 
(26.0
)
Currency translation
(1.6
)
 
(0.8
)
Decrease in obligation due to curtailment / settlement
(1.8
)
 
(0.2
)
End of year
$
428.2

 
$
461.5

Accumulated benefit obligations at end of year
$
428.2

 
$
461.5

Plan assets:
 
 
 
Beginning of year
$
410.5

 
$
395.2

Actual return on plan assets
1.3

 
42.1

Employer contributions
1.2

 
0.1

Settlement
(1.9
)
 
—

Currency translation
(1.7
)
 
(0.9
)
Benefits paid
(26.0
)
 
(26.0
)
End of year
$
383.4

 
$
410.5

Accrued benefit cost at end of year:
 
 
 
Unfunded status
$
(44.8
)
 
$
(51.0
)
Recognized on balance sheet:
 
 
 
Other noncurrent assets
$
0.9

 
$
1.3

Other noncurrent liabilities
(45.7
)
 
(52.3
)
 
$
(44.8
)
 
$
(51.0
)
Recognized in accumulated other comprehensive loss, before tax:
 
 
 
Prior year service cost
$
—

 
$
0.1

Net actuarial loss
113.5

 
119.7

 
$
113.5

 
$
119.8
Schedule of Pension and Other Postretirement Benefits Activity in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Pension Plan activity in accumulated other comprehensive loss, before tax, in 2015 is presented below, in millions.
Balance at beginning of year
$
119.8

Actuarial gain
(2.6
)
Prior year actuarial loss amortization to net periodic cost
(3.2
)
Settlement
(0.5
)
Balance at end of year
$
113.5
Schedule of Components of Accumulated Other Comprehensive Income (Loss) Related to Pension and Other Postretirement Benefits Expected to be Amortized
The components of accumulated other comprehensive loss related to pension that we expect to amortize into net periodic benefit cost in 2016 are presented below, in millions.
Amortization of unrecognized prior year service cost
$
0.1

Amortization of unrecognized loss
3.1

 
$
3.2
Schedule of Assumptions Used
A summary of key assumptions for our pension plans is below.
 
Pension Plans
 
2015
 
2014
 
2013
Weighted average used to determine benefit obligations:
 
 
 
 
 
Discount rate
4.84
%
 
4.49
%
 
5.16
%
Weighted average used to determine net periodic cost:
 
 
 
 
 
Discount rate
4.49
%
 
5.16
%
 
4.21
%
Expected return on plan assets
6.21

 
6.24

 
6.71
Schedule of Strategic Allocation of Plan Assets [Table Text Block]
This trust’s strategic asset allocations, tactical range at September 30, 2015 and actual asset allocations are presented below.
 
Strategic asset allocation
 
 
 
 
 
 
Actual asset allocations at
 
 
 
 
 
 
 
September 30,
 
Tactical range
 
2015
 
2014
 
2013
Equity investments:
 
 
 
 
 
 
 
 
 
 
 
 
Large capitalization stocks
26
%
 

 
 
 
 
 
 
 
 
 
Small capitalization stocks
5

 

 
 
 
 
 
 
 
 
 
International stocks
9

 

 
 
 
 
 
 
 
 
 
 
40

 
30
-
50
%
 
 
39
%
 
40
%
 
40
%
Fixed income investments
60

 
50
-
70

 
 
60

 
59

 
59

Cash
—

 
0
-
5

 
 
1

 
1

 
1

 
100
%
 
 
 
 
 
 
100
%
 
100
%
 
100
%
Schedule of Allocation of Plan Assets
The assets of the Pension Plans by level within the fair value hierarchy are presented below.
 
September 30, 2015
 
Level 1
 
Level 2
 
Total
 
(in millions)
Equity:
 
 
 
 
 
Large cap stocks:
 
 
 
 
 
Large cap growth funds
$
—

 
$
32.7

 
$
32.7

Large cap index funds
—

 
27.1

 
27.1

Large cap value funds
—

 
15.7

 
15.7

Small cap stocks:
 
 
 
 
 
  Small cap growth funds
—

 
18.5

 
18.5

International stocks:
 
 
 
 
 
Mutual funds
42.1

 
—

 
42.1

International funds
—

 
13.9

 
13.9

      Total equity
42.1

 
107.9

 
150.0

Fixed income
—

 
229.4

 
229.4

Cash and cash equivalents
4.0

 
—

 
4.0

 
$
46.1

 
$
337.3

 
$
383.4

 
September 30, 2014
 
Level 1
 
Level 2
 
Total
 
(in millions)
Equity:
 
 
 
 
 
Large cap stocks:
 
 
 
 
 
Large cap growth funds
$
—

 
$
31.5

 
$
31.5

Large cap index funds
—

 
35.9

 
35.9

Large cap value funds
—

 
15.3

 
15.3

Small cap stocks:
 
 
 
 
 
Small cap growth funds
—

 
18.5

 
18.5

International stocks:
 
 
 
 
 
Mutual funds
45.9

 
—

 
45.9

International funds
—

 
15.4

 
15.4

Total equity
45.9

 
116.6

 
162.5

Fixed income
—

 
243.5

 
243.5

Cash and cash equivalents
4.5

 
—

 
4.5

 
$
50.4

 
$
360.1

 
$
410.5
Schedule of Expected Benefit Payments
Our estimated future pension benefit payments are presented below in millions.
2016
$
32.9

2017
26.4

2018
26.6

2019
26.8

2020
27.1

2021-2025
138.0