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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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