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Self-Insured Risks Self-Insured Risks (Tables)
 12 Months Ended
Dec. 31, 2018
Insurance [Abstract]  
Self-Insurance Reserves
The following table presents the changes in our self-insurance reserves for the years ended December 31, 2018, 2017, and 2016 (in millions):
 
2018
 
2017
 
2016
Balance at beginning of period, gross
$
171.0

 
$
171.4

 
$
142.1

Less: Reinsurance receivables
(39.9
)
 
(41.4
)
 
(26.6
)
Balance at beginning of period, net
131.1

 
130.0

 
115.5

Increase for the provision of current year claims
47.1

 
44.7

 
43.5

Decrease for the provision of prior year claims
(8.7
)
 
(3.0
)
 
(0.1
)
Expenses related to discontinued operations
(0.2
)
 
(0.5
)
 
(0.4
)
Payments related to current year claims
(7.0
)
 
(5.0
)
 
(5.0
)
Payments related to prior year claims
(27.0
)
 
(35.1
)
 
(23.5
)
Balance at end of period, net
135.3

 
131.1

 
130.0

Add: Reinsurance receivables
25.6

 
39.9

 
41.4

Balance at end of period, gross
$
160.9

 
$
171.0

 
$
171.4