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Restructuring Charges - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items] |  |
Liability for COBRA | $ 127.0 | $ 127.0
Receivable from credits from ARPA | 106.0 | 106.0
Difference between liability for COBRA and receivable from credits from ARPA | 21.0 |
Property-Level Programs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges |  | 268.0
U.S. & Canada | Above-Property and Property-Level Programs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 18.0 | $ 273.0
Reimbursed expenses | Property-Level Programs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 18.0 |
Restructuring and merger-related charges | Property-Level Programs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 1.0 |

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