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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Components of Accumulated Other Comprehensive Income, Net of Tax
The following tables summarize those reclassification adjustments (net of taxes):
 
Year Ended December 31, 2019
 
Unrealized
 gains on
 securities
 
OTTI
 
Accumulated
 other
 comprehensive
 income
Balance at December 31, 2018
$
73.5

 
$
8.8

 
$
82.3

Change in accumulated other comprehensive income before reclassifications
71.0

 
1.0

 
72.0

Amounts reclassified from accumulated other comprehensive income
(3.0
)
 
—

 
(3.0
)
Net current-period other comprehensive income
68.0

 
1.0

 
69.0

Balance at December 31, 2019
$
141.5

 
$
9.8

 
$
151.3

 
Year Ended December 31, 2018
 
Unrealized
 gains on
 securities
 
OTTI
 
Accumulated
 other
 comprehensive
 income
Balance at December 31, 2017
$
119.0

 
$
9.2

 
$
128.2

Change in accumulated other comprehensive income before reclassifications
(58.2
)
 
(2.4
)
 
(60.6
)
Amounts reclassified from accumulated other comprehensive income
(3.9
)
 
—

 
(3.9
)
Net current-period other comprehensive loss
(62.1
)
 
(2.4
)
 
(64.5
)
Cumulative effect of change in accounting principles (1)
16.6

 
2.0

 
18.6

Balance at December 31, 2018
$
73.5

 
$
8.8

 
$
82.3

(1) See Note 2 - Summary of Significant Accounting Policies for additional information.
 
Year Ended December 31, 2017
 
Unrealized
 gains on
 securities
 
OTTI
 
Accumulated
 other
 comprehensive
 income
Balance at December 31, 2016
$
95.1

 
$
8.6

 
$
103.7

Change in accumulated other comprehensive income before reclassifications
27.8

 
0.6

 
28.4

Amounts reclassified from accumulated other comprehensive income
(3.9
)
 
—

 
(3.9
)
Net current-period other comprehensive income
23.9

 
0.6

 
24.5

Balance at December 31, 2017
$
119.0

 
$
9.2

 
$
128.2
Summary of the Reclassifications Out of Accumulated Other Comprehensive Income
The following tables summarize the reclassifications out of accumulated other comprehensive income:
Details about accumulated
 other comprehensive
 income components
 
Amount reclassified from accumulated
 other comprehensive income
 
Affected line item in the statement
 where net income is presented
 
 
Years Ended December 31,
 
 
 
 
2019
 
2018
 
2017
 
 
Unrealized gains on securities
 
$
(3.8
)
 
$
(4.9
)
 
$
(6.0
)
 
Net realized gains on investments, excluding
other-than-temporary impairment losses
Tax effect
 
0.8

 
1.0

 
2.1

 
Provision for income taxes
Total reclassifications for the period
 
$
(3.0
)
 
$
(3.9
)
 
$
(3.9
)
 
Net of tax