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Deferred Acquisition Costs
 12 Months Ended
Dec. 31, 2019
Deferred Policy Acquisition Costs Disclosures [Abstract]  
Deferred Acquisition Costs Deferred Acquisition Costs 
Information about deferred acquisition costs is as follows as of the dates indicated:
 
December 31,
 
2019
 
2018
 
2017
Beginning balance
$
5,103.0

 
$
3,484.5

 
$
3,267.4

Costs deferred
3,747.3

 
3,094.0

 
1,549.2

Amortization
(2,182.3
)
 
(1,475.5
)
 
(1,332.1
)
Ending balance
$
6,668.0

 
$
5,103.0

 
$
3,484.5