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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in accumulated other comprehensive income (loss) by component
Changes in accumulated other comprehensive income (loss) by component were as follows:
(in millions)
 
Unrealized
Gains on
Investments
 
Currency
Translation
Adjustments
 
Unrealized
Losses on
Defined Benefit
Plans
 
Total
for the three months ended June 30, 2017
 
 
 
 
Balance at April 1, 2017
 
$
3.0

 
$
(368.1
)
 
$
(8.1
)
 
$
(373.2
)
Other comprehensive income (loss)
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications, net of tax
 
(0.1
)
 
54.0

 
(0.2
)
 
53.7

Reclassifications to net investment and other income, net of tax
 
(1.5
)
 
—

 
—

 
(1.5
)
Total other comprehensive income (loss)
 
(1.6
)
 
54.0

 
(0.2
)
 
52.2

Balance at June 30, 2017
 
$
1.4

 
$
(314.1
)
 
$
(8.3
)
 
$
(321.0
)
(in millions)
 
Unrealized
Gains on
Investments
 
Currency
Translation
Adjustments
 
Unrealized
Losses on
Defined Benefit
Plans
 
Total
for the nine months ended June 30, 2017
 
 
 
 
Balance at October 1, 2016
 
$
6.8

 
$
(346.1
)
 
$
(8.1
)
 
$
(347.4
)
Adoption of new accounting guidance
 
(6.8
)
 
(0.3
)
 
—

 
(7.1
)
Other comprehensive income (loss)
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications, net of tax
 
3.9

 
32.3

 
(0.2
)
 
36.0

Reclassifications to net investment and other income, net of tax
 
(2.5
)
 
—

 
—

 
(2.5
)
Total other comprehensive income (loss)
 
1.4


32.3


(0.2
)

33.5

Balance at June 30, 2017
 
$
1.4


$
(314.1
)

$
(8.3
)

$
(321.0
)
(in millions)
 
Unrealized
Gains on
Investments
 
Currency
Translation
Adjustments
 
Unrealized
Losses on
Defined Benefit
Plans
 
Total
for the three months ended June 30, 2016
 
 
 
 
Balance at April 1, 2016
 
$
7.0

 
$
(319.7
)
 
$
(5.1
)
 
$
(317.8
)
Other comprehensive income (loss)
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications, net of tax
 
(4.9
)
 
(30.8
)
 
0.2

 
(35.5
)
Reclassifications to net investment and other income, net of tax
 
0.8

 
—

 
—

 
0.8

Total other comprehensive income (loss)
 
(4.1
)
 
(30.8
)
 
0.2

 
(34.7
)
Balance at June 30, 2016
 
$
2.9

 
$
(350.5
)
 
$
(4.9
)
 
$
(352.5
)
(in millions)
 
Unrealized
Gains on
Investments
 
Currency
Translation
Adjustments
 
Unrealized
Losses on
Defined Benefit
Plans
 
Total
for the nine months ended June 30, 2016
 
 
 
 
Balance at October 1, 2015
 
$
19.3

 
$
(327.8
)
 
$
(5.7
)
 
$
(314.2
)
Other comprehensive income (loss)
 
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications, net of tax
 
(2.4
)
 
(22.7
)
 
0.8

 
(24.3
)
Reclassifications to net investment and other income, net of tax
 
(14.0
)
 
—

 
—

 
(14.0
)
Total other comprehensive income (loss)
 
(16.4
)

(22.7
)

0.8


(38.3
)
Balance at June 30, 2016
 
$
2.9


$
(350.5
)

$
(4.9
)

$
(352.5
)