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Retirement Benefits, (As Restated for fiscal 2014 and 2013) (Tables)
 12 Months Ended
Nov. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of Company's Plan Assets, Benefit Obligations, and Funded Status
Plan assets, benefit obligations, and the funded status of the plans were determined at November 30, 2015 and 2014 for fiscal 2015 and 2014, respectively.
 
Pension Benefits 
 
Medical and
Life Insurance
Benefits
 
As of November 30,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Change in fair value of plan assets:
 
 
 
 
 
 
 
Fair value - beginning of year
$
1,163.1

 
$
1,249.2

 
$
—

 
$
—

(Loss) gain on plan assets
(64.2
)
 
63.5

 
—

 
—

Employer contributions
1.3

 
1.2

 
4.8

 
5.3

Benefits paid (1)
(136.1
)
 
(133.7
)
 
(4.8
)
 
(5.3
)
Lump sum distributions (2)
—

 
(17.1
)
 
—

 
—

Fair value - end of year
$
964.1

 
$
1,163.1

 
$
—

 
$
—

Change in benefit obligation:
 
 
 
 
 
 
 
Benefit obligation - beginning of year
$
1,666.3

 
$
1,538.6

 
$
58.1

 
$
66.6

Service cost
10.8

 
8.8

 
—

 
0.1

Interest cost
63.6

 
67.1

 
1.9

 
2.5

Plan amendments
2.5

 
—

 
—

 
—

Actuarial losses (gains)
(57.6
)
 
202.6

 
(3.7
)
 
(5.8
)
Benefits paid
(136.1
)
 
(133.7
)
 
(4.8
)
 
(5.3
)
Lump sum distributions (2)
—

 
(17.1
)
 
—

 
—

Benefit obligation - end of year (3)
$
1,549.5

 
$
1,666.3

 
$
51.5

 
$
58.1

Funded status of the plans
$
(585.4
)
 
$
(503.2
)
 
$
(51.5
)
 
$
(58.1
)
Amounts recognized in the consolidated balance sheets:
 
 
 
 
 
 
 
Postretirement medical and life insurance benefits, current
$
—

 
$
—

 
$
(6.0
)
 
$
(6.4
)
Postretirement medical and life insurance benefits, noncurrent
—

 
—

 
(45.5
)
 
(51.7
)
Pension liability, non-qualified current (component of other current liabilities)
(1.3
)
 
(1.3
)
 
—

 
—

Pension liability, non-qualified (component of other noncurrent liabilities)
(17.9
)
 
(19.1
)
 
—

 
—

Pension benefits, noncurrent
(566.2
)
 
(482.8
)
 
—

 
—

Net liability recognized in the consolidated balance sheets
$
(585.4
)
 
$
(503.2
)
 
$
(51.5
)
 
$
(58.1
)
__________ 
(1)
Benefits paid for medical and life insurance benefits are net of the Medicare Part D Subsidy of $0.2 million received in fiscal 2015 and 2014.
(2)
During fiscal 2014, the Company offered and distributed lump sum pension payouts to terminated vested participants in the pension plan with a lump sum present value of less than $25,000.
(3)
Pension benefit obligation includes $19.2 million and $20.4 million as of November 30, 2015 and 2014, respectively, for the non-qualified plan.
Summary of Components of Retirement Benefit Expense (Income)
Components of retirement benefit expense (income) are: 
 
Pension Benefits
 
Medical and
Life Insurance Benefits 
 
Year Ended
 
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
(In millions)
Service cost
$
10.8

 
$
8.8

 
$
6.3

 
$
—

 
$
0.1

 
$
0.1

Interest cost on benefit obligation
63.6

 
67.1

 
61.0

 
1.9

 
2.5

 
2.4

Assumed return on plan assets (1)
(88.1
)
 
(92.6
)
 
(96.4
)
 
—

 
—

 
—

Amortization of prior service credits
—

 
—

 
—

 
(1.1
)
 
(0.9
)
 
(0.9
)
Amortization of net losses (gains)
84.0

 
54.4

 
94.6

 
(3.5
)
 
(2.9
)
 
(2.1
)
 
$
70.3

 
$
37.7

 
$
65.5

 
$
(2.7
)
 
$
(1.2
)
 
$
(0.5
)
__________ 
(1)
The actual return and rate of return on plan assets are as follows:
 
 
Year Ended 
 
 
2015
 
2014
 
2013
 
(In millions, except rate of return)
Actual return on plan assets
$
(64.2
)
 
$
63.5

 
$
141.4

Actual rate of return on plan assets
(6.1
)%
 
5.1
%
 
11.8
%
Schedule of Assumptions Used to Determine Benefit Obligations
The Company used the following assumptions, calculated based on a weighted-average, to determine the benefit obligations for the applicable fiscal year.
 
Pension
Benefits
 
Medical and
Life Insurance Benefits
 
2015
 
2014
 
2015
 
2014
Discount rate
4.26
%
 
3.96
%
 
3.87
%
 
3.54
%
Discount rate (benefit restoration plan)
4.32
%
 
4.01
%
 
*

 
*

Ultimate healthcare trend rate
*

 
*

 
5.00
%
 
5.00
%
Initial healthcare trend rate (pre 65/post 65)
*

 
*

 
7.00
%
 
7.00
%
Year ultimate rate attained (pre 65/post 65)
*

 
*

 
2021

 
2021

______
*
Not applicable
Schedule of Assumptions Used to Determine Periodic Benefit Expense (Income)
The Company used the following assumptions, calculated based on a weighted-average, to determine the periodic benefit expense (income) for the applicable fiscal year.
 
Pension Benefits 
 
Medical and
Life Insurance Benefits 
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Discount rate
3.96
%
 
4.54
%
 
3.68
%
 
3.54
%
 
3.98
%
 
3.24
%
Discount rate (benefit restoration plan)
4.01
%
 
4.65
%
 
3.77
%
 
*

 
*

 
*

Expected long-term rate of return on plan assets
8.00
%
 
8.00
%
 
8.00
%
 
*

 
*

 
*

Ultimate healthcare trend rate
*

 
*

 
*

 
5.00
%
 
5.00
%
 
5.00
%
Initial healthcare trend rate (pre 65/post 65)
*

 
*

 
*

 
7.00
%
 
8.50
%
 
8.75
%
Year ultimate rate attained (pre 65/post 65)
*

 
*

 
*

 
2021

 
2021

 
2021

______
*
Not applicable
Schedule of One Percentage Point Change in Assumptions Effects on Projected Benefit Obligations
A one percentage point change in the key assumptions would have the following effects on the projected benefit obligations as of November 30, 2015 and on expense for fiscal 2015:
 
Pension Benefits and
Medical and Life Insurance Benefits Discount Rate
 
Expected Long-term
Rate of Return
 
Assumed Healthcare
Cost Trend Rate
 
Net Periodic
Benefit Expense
 
Projected
Benefit
Obligation
 
Net Periodic Pension
Benefit Expense
 
Net Periodic
Medical and Life
Insurance Benefit Expense
 
Accumulated
Benefit
Obligation
 
(In millions)
1% decrease
$
26.5

 
$
166.1

 
$
11.1

 
$
(0.4
)
 
$
(1.3
)
1% increase
(22.5
)
 
(139.6
)
 
(11.1
)
 
0.4

 
1.5
Schedule of Pension Plan's Asset Allocations by Asset Category
The Company’s pension plan's asset allocations as of November 30, 2015 and 2014, by asset category, are as follows:
 
As of November 30,
 
2015
 
2014
Cash and cash equivalents
35
%
 
18
%
Equity securities
35

 
32

Fixed income
13

 
16

Real estate investments
—

 
2

Private equity holdings
7

 
9

Alternative investments
10

 
23

Total
100
%
 
100
%
Schedule of Fair Value of Pension Plan Assets and Liabilities by Asset Category and by Level
The fair value of the Company’s pension plan assets and liabilities by asset category and by level were as follows:
 
Total
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(In millions)
November 30, 2015
 
 
 
 
 
 
 
Cash and cash equivalents
$
101.5

 
$
101.5

 
$
—

 
$
—

Equity securities:
 
 
 
 
 
 
 
  Domestic equity securities
361.4

 
352.9

 
8.0

 
0.5

  International equity securities
34.3

 
34.3

 
—

 
—

  Derivatives:
 
 
 
 
 
 
 
    Written options
0.2

 
0.2

 
—

 
—

  Short sales
(62.8
)
 
(62.8
)
 
—

 
—

Fixed income:
 
 
 
 
 
 
 
  Corporate debt securities
27.5

 
—

 
27.5

 
—

  Asset-backed securities
96.9

 
—

 
96.9

 
—

  Short sales
(3.2
)
 
(2.5
)
 
(0.7
)
 
—

Real estate investments
0.7

 
—

 
—

 
0.7

Total assets at fair value
556.5

 
$
423.6

 
$
131.7

 
$
1.2

Investment measured at NAV
 
 
 
 
 
 
 
  Private equity holdings
62.8

 
 
 
 
 
 
  Alternative investments
97.7

 
 
 
 
 
 
  Common/collective trusts ("CCTs")
245.3

 
 
 
 
 
 
Total investments measured at NAV
405.8

 
 
 
 
 
 
Receivables
3.8

 
 
 
 
 
 
Payables
(2.0
)
 
 
 
 
 
 
Total assets
$
964.1

 
 
 
 
 
 
 
Total
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
(In millions)
November 30, 2014
 
 
 
 
 
 
 
Cash and cash equivalents
$
166.4

 
$
166.4

 
$
—

 
$
—

Equity securities:
 
 
 
 
 
 
 
  Domestic equity securities
418.5

 
412.0

 
6.5

 
—

  International equity securities
43.3

 
43.3

 
—

 
—

  Derivatives:
 
 
 
 
 
 
 
    Purchased options
0.5

 
0.5

 
—

 
—

    Written options
(0.6
)
 
(0.6
)
 
—

 
—

  Short sales
(96.6
)
 
(96.6
)
 
—

 
—

Fixed income:
 
 
 
 
 
 
 
  Corporate debt securities
86.0

 
1.0

 
84.7

 
0.3

  Asset-backed securities
114.0

 
—

 
114.0

 
—

  Short sales
(15.4
)
 
(10.4
)
 
(5.0
)
 
—

Real estate investments
25.3

 
—

 
—

 
25.3

Total
741.4

 
$
515.6

 
$
200.2

 
$
25.6

Investment measured at NAV
 
 
 
 
 
 
 
  Private equity holdings
106.8

 
 
 
 
 
 
  Alternative investments
267.7

 
 
 
 
 
 
 CCTs
45.7

 
 

 
 
 
 
Total investments measured at NAV
420.2

 
 
 
 
 
 
Receivables
12.9

 
 
 
 
 
 
Payables
(11.4
)
 
 
 
 
 
 
Total assets
$
1,163.1

 
 
 
 
 
 
Schedule of Changes in Fair Value of Level 3 Investments
Changes in the fair value of the Level 3 investments were as follows:
 
November 30,
2014 
 
Unrealized
Gains (Losses)
on Plan Assets 
 
Realized
Gains (Losses)
on Plan Assets
 
Purchases,
Issuances, and
Settlements 
 
Transfers
out of
Level 3
 
November 30,
2015 
 
(In millions)
Equity securities:
 
 
 
 
 
 
 
 
 
 
 
 Domestic equity securities
$
—

 
$
(0.3
)
 
$
—

 
$
—

 
$
0.8

 
$
0.5

Fixed income:
 
 
 
 
 
 
 
 
 
 
 
 Corporate debt securities
0.3

 
0.1

 
0.3

 
(0.7
)
 
—

 
—

Real estate investments
25.3

 
0.2

 
—

 
(24.8
)
 
—

 
0.7

Total
$
25.6

 
$
—

 
$
0.3

 
$
(25.5
)
 
$
0.8

 
$
1.2

 
November 30,
2013 
 
Unrealized
Gains (Losses)
on Plan Assets 
 
Realized
Gains (Losses)
on Plan Assets
 
Purchases,
Issuances, and
Settlements 
 
November 30,
2014 
 
(In millions)
Equity securities:
 
 
 
 
 
 
 
 
 
 Domestic equity securities
$
0.3

 
$
(0.3
)
 
$
—

 
$
—

 
$
—

Fixed income:
 
 
 
 
 
 
 
 
 
 Corporate debt securities
0.4

 
(0.1
)
 
—

 
—

 
0.3

Real estate investments
15.7

 
10.0

 
—

 
(0.4
)
 
25.3

Total
$
16.4

 
$
9.6

 
$
—

 
$
(0.4
)
 
$
25.6
Schedule of Estimated Future Benefit Payments
The following presents estimated future benefit payments:
 
 
Pension
Benefit
Payments
 
Medical and Life Insurance Benefits 
 
Year Ending November 30,
 
Gross Benefit Payments
 
Medicare D
Subsidy 
 
Net Benefit
Payments 
 
(In millions)
2016
$
123.6

 
$
6.3

 
$
0.3

 
$
6.0

2017
122.0

 
6.1

 
0.3

 
5.8

2018
119.9

 
5.8

 
0.3

 
5.5

2019
117.2

 
5.4

 
0.2

 
5.2

2020
114.5

 
5.1

 
0.2

 
4.9

Years 2021 - 2025
525.2

 
19.6

 
0.8

 
18.8