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Restructuring Charges (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]                      
Severance and termination costs                 $ 140,400,000 $ 22,000,000.0 $ 0.0
Lease Restructuring Cost                 256,000,000.0 11,900,000 0.0
Other Restructuring Costs                 17,400,000 0.0 0.0
Restructuring Charges $ 253,900,000 $ 47,300,000 $ 112,600,000 $ 0.0 $ 0.0 $ 0.0 $ 2,100,000 $ 31,800,000 413,800,000 $ 33,900,000 $ 0.0
Non-cash Items [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Severance and termination costs                 4,500,000    
Lease Restructuring Cost                 256,000,000.0    
Other Restructuring Costs                 5,100,000    
Restructuring Charges                 265,600,000    
Cash Payments [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Severance and termination costs                 61,300,000    
Lease Restructuring Cost                 0.0    
Other Restructuring Costs                 12,300,000    
Restructuring Charges                 $ 73,600,000