Accounts Receivable - Table 1 (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Accounts Receivable, Net, Current
Patient accounts receivable, net of allowance for doubtful accounts of $23.1 million in 2013; $28.7 million in 2012	$ 249.4	$ 231.3
Other accounts receivable	12.4	18.0
Accounts receivable, net, current	261.8	249.3
Noncurrent patient accounts receivable, net of allowance for doubtful accounts of $10.0 million in 2013	16.6	0
Accounts receivable, net	278.4	249.3
Allowance for Doubtful Accounts [Abstract]
Allowance for doubtful accounts receivable, current	23.1	28.7
Allowance for doubtful accounts receivable, noncurrent	$ 10.0