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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2017
Defined Benefit Plan [Abstract]  
Schedule of Net Periodic Benefit Cost
During March 2017, the Financial Accounting Standards Board issued Accounting Standards Update No. 2017-07 (“ASU 2017-07”). This amendment to GAAP will require us to exclude from operating income the components of net periodic benefit cost other than service cost. We adopted this amendment on October 1, 2017, and this adoption will require reclassification of amounts included in 2017 and 2016 results. The components of net periodic benefit cost for our Pension Plans and the effects this adoption will have on operating income are presented below.
 
2017
 
2016
 
2015
 
(in millions)
Service cost
$
2.0

 
$
1.7

 
$
1.9

Components of net periodic benefit cost that will be excluded from operating income upon adoption of ASU 2017-07:
 
 
 
 
 
Interest cost
14.3

 
18.9

 
20.1

Expected return on plan assets
(16.9
)
 
(19.7
)
 
(24.6
)
Amortization of actuarial net loss
4.0

 
3.4

 
3.2

Pension settlement
—

 
16.6

 
0.5

Other
—

 
0.1

 
—

 
1.4

 
19.3

 
(0.8
)
Net periodic benefit cost
$
3.4

 
$
21.0

 
$
1.1
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,
 
2017
 
2016
 
(in millions)
Projected benefit obligations
$
379.5

 
$
402.0

Accumulated benefit obligations
379.5

 
402.0

Fair value of plan assets
364.2

 
337.9

Balance sheet information for Pension Plans with accumulated benefit obligations less than plan assets is presented below.
 
September 30,
 
2017
 
2016
 
(in millions)
Projected benefit obligations
$
1.0

 
$
1.1

Accumulated benefit obligations
1.0

 
1.1

Fair value of plan assets
2.1

 
2.1
Schedule Of Defined Benefit Plans Disclosures
Amounts recognized for Pension Plans and other postretirement benefit plans are presented below.
 
Pension Plans
 
2017
 
2016
 
(in millions)
Projected benefit obligations:
 
 
 
Beginning of year
$
403.1

 
$
428.2

Service cost
2.0

 
1.7

Interest cost
14.3

 
18.9

Actuarial loss (gain)
(14.5
)
 
37.7

Benefits paid
(24.8
)
 
(25.1
)
Currency translation
0.4

 
0.2

Decrease in obligation due to curtailment / settlement
—

 
(58.5
)
End of year
$
380.5

 
$
403.1

Accumulated benefit obligations at end of year
$
380.5

 
$
403.1

Plan assets:
 
 
 
Beginning of year
$
340.0

 
$
383.4

Actual return on plan assets
15.8

 
40.1

Employer contributions
35.0

 
—

Settlement
—

 
(58.5
)
Currency translation
0.4

 
0.1

Benefits paid
(24.8
)
 
(25.1
)
Other
(0.1
)
 
—

End of year
$
366.3

 
$
340.0

Accrued benefit cost at end of year:
 
 
 
Unfunded status
$
(14.2
)
 
$
(63.1
)
Recognized on balance sheet:
 
 
 
Other noncurrent assets
$
1.1

 
$
1.0

Other current liabilities
(1.1
)
 
(1.2
)
Other noncurrent liabilities
(14.2
)
 
(62.9
)
 
$
(14.2
)
 
$
(63.1
)
Recognized in accumulated other comprehensive loss, before tax:
 
 
 
Prior year service cost
$
—

 
$
—

Net actuarial loss
93.4

 
110.8

 
$
93.4

 
$
110.8
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 2017 is presented below, in millions.
Balance at beginning of year
$
110.8

Actuarial loss
(13.5
)
Prior year actuarial loss amortization to net periodic cost
(4.0
)
Other
0.1

Balance at end of year
$
93.4
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 Plans that we expect to amortize into net periodic benefit cost in 2018 are presented below, in millions.
Amortization of unrecognized prior year service cost
$
—

Amortization of unrecognized loss
3.2

 
$
3.2
Schedule of Assumptions Used
A summary of key assumptions for our pension plans is below.
 
Pension Plans
 
2017
 
2016
 
2015
Weighted average used to determine benefit obligations:
 
 
 
 
 
Discount rate
3.88
%
 
3.68
%
 
4.84
%
Weighted average used to determine net periodic cost:
 
 
 
 
 
Discount rate
3.68
%
 
3.92
%
 
4.49
%
Expected return on plan assets
5.16

 
5.50

 
6.21
Schedule of Strategic Allocation of Plan Assets [Table Text Block]
his trust’s strategic asset allocations, tactical range at September 30, 2017 and actual asset allocations are presented below.
 
Strategic asset allocation
 
 
 
 
 
 
Actual asset allocations at
 
 
 
 
 
 
 
September 30,
 
Tactical range
 
2017
 
2016
 
2015
Equity investments:
 
 
 
 
 
 
 
 
 
 
 
 
Large capitalization stocks
12
%
 

 
 
 
 
 
 
 
 
 
Small capitalization stocks
3

 

 
 
 
 
 
 
 
 
 
International stocks
5

 

 
 
 
 
 
 
 
 
 
 
20

 
15
-
20
%
 
 
21
%
 
29
%
 
39
%
Fixed income investments
80

 

 
80

 
 
78

 
69

 
60

Cash
—

 
0
-
5

 
 
1

 
2

 
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, 2017
 
Level 1
 
Level 2
 
Total
 
(in millions)
Equity:
 
 
 
 
 
Large cap stocks:
 
 
 
 
 
Large cap growth funds
$
—

 
$
32.6

 
$
32.6

Mid cap stocks:
 
 
 
 
 
   Mid cap index funds
—

 
10.9

 
10.9

Small cap stocks:
 
 
 
 
 
  Small cap growth funds
—

 
11.3

 
11.3

International stocks:
 
 
 
 
 
Mutual funds
15.4

 
—

 
15.4

International funds
—

 
7.4

 
7.4

      Total equity
15.4

 
62.2

 
77.6

Fixed income
—

 
284.4

 
284.4

Cash and cash equivalents
4.3

 
—

 
4.3

 
$
19.7

 
$
346.6

 
$
366.3

 
September 30, 2016
 
Level 1
 
Level 2
 
Total
 
(in millions)
Equity:
 
 
 
 
 
Large cap stocks:
 
 
 
 
 
Large cap growth funds
$
—

 
$
7.3

 
$
7.3

Large cap index funds
—

 
38.2

 
38.2

Large cap value funds
—

 
7.2

 
7.2

Small cap stocks:
 
 
 
 
 
Small cap growth funds
—

 
15.1

 
15.1

International stocks:
 
 
 
 
 
Mutual funds
13.5

 
—

 
13.5

International funds
—

 
18.1

 
18.1

Total equity
13.5

 
85.9

 
99.4

Fixed income
—

 
233.3

 
233.3

Cash and cash equivalents
7.3

 
—

 
7.3

 
$
20.8

 
$
319.2

 
$
340.0
Schedule of Expected Benefit Payments
Our estimated future pension benefit payments are presented below in millions.
2018
$
32.1

2019
25.4

2020
25.4

2021
25.2

2022
25.0

2023-2027
120.1