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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable consists of the following (in millions):
 
As of December 31,
 
2017
 
2016
Current:
 
 
 
Patient accounts receivable, net of allowance for doubtful accounts of $60.9 million in 2017; $53.9 million in 2016
$
459.5

 
$
432.0

Other accounts receivable
12.6

 
11.8

 
472.1

 
443.8

Noncurrent patient accounts receivable, net of allowance for doubtful accounts of $52.2 million in 2017; $49.5 million in 2016
129.1

 
125.9

Accounts receivable, net
$
601.2

 
$
569.7
Schedule of Activity Related to Allowance for Doubtful Accounts
The following is the activity related to our allowance for doubtful accounts (in millions):
For the Year Ended December 31,
 
Balance at Beginning of Period
 
Additions and Charges to Expense
 
Deductions and Accounts Written Off
 
Balance at End of Period
2017
 
$
103.4

 
$
52.4

 
$
(42.7
)
 
$
113.1

2016
 
$
71.6

 
$
61.2

 
$
(29.4
)
 
$
103.4

2015
 
$
43.0

 
$
47.2

 
$
(18.6
)
 
$
71.6