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Summary of Significant Accounting Policies - Textual (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) state | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total liabilities |  | $ 3,356.3 | $ 3,248.2 |  |
Total assets | [1] | $ 5,175.0 | 4,864.5 |  |
Number of states in which Entity operates | state |  | 36 |  |  |
Collection success rate of denied payments (percent) |  | 70.00% |  |  |
Minimum accrual of loss contingency needed to accrue for related legal fees |  | $ 5.0 |  |  |
Advertising expense |  | $ 6.7 | $ 6.3 | $ 7.5 |
Payor Source [Member] | Revenue from Contract with Customer [Member] | Medicare [Member] | RAC Audits [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Percentage of Medicare patient discharges (percent) |  | 1.00% |  |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total liabilities |  |  |  |  | $ 330.0
Total assets |  |  |  |  | 330.0
Maximum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total liabilities |  |  |  |  | 370.0
Total assets |  |  |  |  | $ 370.0
[1] | Our consolidated assets as of December 31, 2018 and December 31, 2017 include total assets of variable interest entities of $197.5 million and $264.1 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2018 and December 31, 2017 include total liabilities of the variable interest entities of $50.8 million and $52.5 million, respectively. See Note 3, Variable Interest Entities.

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