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Shareholders' Equity Shareholders' Equity (Tables)
 12 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income Reflected in Consolidated Statements of Permanent Equity
The cumulative amounts of the components of accumulated other comprehensive income reflected in the accompanying Consolidated Statements of Shareholders’ Equity, as of September 30, 2017, 2016 and 2015, were as follows:
 
 
Unrealized
Investment
Gains, net
 
Non-credit
Related
Other-than-
temporary
Impairments
 
Other
Unrealized
Gains (Losses)
— Cash Flow
Hedges
 
Actuarial
Adjustments
to Pension
Plans
 
Cumulative
Translation
Adjustments
 
Total
Cumulative components at September 30, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts (after reclassification adjustments)
 
$
1,134.9

 
$
(2.4
)
 
$
(35.4
)
 
$
(58.7
)
 
$
(135.1
)
 
$
903.3

Intangible assets adjustments
 
(298.9
)
 
0.4

 
—

 
—

 
—

 
(298.5
)
Tax effects
 
(291.6
)
 
0.2

 
9.5

 
3.6

 
3.5

 
(274.8
)
Noncontrolling interest
 
(106.5
)
 
—

 
10.1

 
21.5

 
53.9

 
(21.0
)
 
 
$
437.9

 
$
(1.8
)
 
$
(15.8
)
 
$
(33.6
)
 
$
(77.7
)
 
$
309.0

Cumulative components at September 30, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts (after reclassification adjustments)
 
$
940.5

 
$
(2.4
)
 
$
7.0

 
$
(87.7
)
 
$
(164.2
)
 
$
693.2

Intangible assets adjustments
 
(258.6
)
 
0.4

 
—

 
—

 
—

 
(258.2
)
Tax effects
 
(237.1
)
 
0.2

 
(3.8
)
 
12.1

 
3.5

 
(225.1
)
Noncontrolling interest
 
(86.0
)
 
—

 
(1.7
)
 
30.4

 
68.3

 
11.0

 
 
$
358.8

 
$
(1.8
)
 
$
1.5

 
$
(45.2
)
 
$
(92.4
)
 
$
220.9

Cumulative components at September 30, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts (after reclassification adjustments)
 
$
147.2

 
$
(1.0
)
 
$
(3.0
)
 
$
(48.4
)
 
$
(155.7
)
 
$
(60.9
)
Intangible assets adjustments
 
(0.3
)
 
0.4

 
—

 
—

 
—

 
0.1

Tax effects
 
(51.4
)
 
0.2

 
(0.9
)
 
1.3

 
3.5

 
(47.3
)
Noncontrolling interest
 
(17.4
)
 
—

 
1.3

 
18.6

 
64.9

 
67.4

 
 
$
78.1

 
$
(0.4
)
 
$
(2.6
)
 
$
(28.5
)
 
$
(87.3
)
 
$
(40.7
)
Schedule of Shares of Common Stock Repurchased [Table Text Block]
 
 
Shares repurchased
 
Weighted-Average Price per Share
 
Amount Repurchased
Cumulative balance through September 30, 2017 (a)
 
6,900

 
$
12.71

 
$
87.7

Cumulative balance through September 30, 2016 (a)
 
6,900

 
$
12.71

 
$
87.7

Cumulative balance through September 30, 2015 (a)
 
6,900

 
$
12.71

 
$
87.7