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Self-Insured Risks Self-Insured Risks (Tables)
 12 Months Ended
Dec. 31, 2016
Insurance [Abstract]  
Self-Insurance Reserves
The following table presents the changes in our self-insurance reserves for the years ended December 31, 2016, 2015, and 2014 (in millions):
 
2016
 
2015
 
2014
Balance at beginning of period, gross
$
142.1

 
$
134.3

 
$
140.3

Less: Reinsurance receivables
(26.6
)
 
(26.0
)
 
(32.6
)
Balance at beginning of period, net
115.5

 
108.3

 
107.7

Increase for the provision of current year claims
43.5

 
37.1

 
34.7

Decrease for the provision of prior year claims
(0.1
)
 
(4.6
)
 
(3.5
)
Expenses related to discontinued operations
(0.4
)
 
(0.5
)
 
(0.3
)
Payments related to current year claims
(5.0
)
 
(4.7
)
 
(4.4
)
Payments related to prior year claims
(23.5
)
 
(22.5
)
 
(25.9
)
Acquisitions
—

 
2.4

 
—

Balance at end of period, net
130.0

 
115.5

 
108.3

Add: Reinsurance receivables
41.4

 
26.6

 
26.0

Balance at end of period, gross
$
171.4

 
$
142.1

 
$
134.3