Self-Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Self-Insurance [Abstract]
Loss Contingency, Receivable, Total	$ 41.5	$ 52.7
Self-insured portions of programs accrued, total	248.4	301.6
Accrued self-insured portions of programs , noncurrent	153.5	184.7
Secured self-insured retention risk under workers' compensation, general liability, and professional liability programs with cash	15.6	19.6
Letters of credit associated to the secured self-insured retention risk	49.8	$ 33.8
Cash deposit to collateralize the insurance policy	$ 40.5