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Self-Insured Risks (Tables)
12 Months Ended
Dec. 31, 2020
Insurance [Abstract]  
Self-Insurance Reserves
The following table presents the changes in our self-insurance reserves for the years ended December 31, 2020, 2019, and 2018 (in millions):
202020192018
Balance at beginning of period, gross$157.3 $160.9 $171.0 
Less: Reinsurance receivables
(26.4)(25.6)(39.9)
Balance at beginning of period, net130.9 135.3 131.1 
Increase for the provision of current year claims52.5 46.9 47.1 
Decrease for the provision of prior year claims(15.0)(12.6)(8.7)
Expenses related to discontinued operations(0.2)(0.1)(0.2)
Payments related to current year claims(8.4)(7.5)(7.0)
Payments related to prior year claims(22.9)(31.1)(27.0)
Balance at end of period, net136.9 130.9 135.3 
Add: Reinsurance receivables
28.3 26.4 25.6 
Balance at end of period, gross$165.2 $157.3 $160.9