Concentration Risk (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Supplier Concentration Risk | |||
| Concentration Risk [Line Items] | |||
| Expenses incurred on hotel and restaurant services | $ 153.6 | $ 153.7 | $ 152.3 |