Restructuring Charges - Narrative (Details) $ in Millions	6 Months Ended	15 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Difference between liability for COBRA and receivable from credits from ARPA	$ 4.0
American Rescue Plan Act of 2021, Benefit Coverage Continuation
Restructuring Cost and Reserve [Line Items]
Liability for COBRA	40.0	$ 40.0
Receivable credits from ARPA	36.0	36.0
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	17.0	$ 272.0
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