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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]      
Interest Paid, Excluding Capitalized Interest, Operating Activities $ 182.2 $ 192.7 $ 88.7
Change in operating lease right-of-use asset and lease liabilities 192.6 9.4  
Cash paid for income taxes, net of refunds [1] 89.1 150.2 207.9
Tax refunds 124.2 92.6 24.3
Restructuring Charges 413.8 33.9 $ 0.0
Supplemental Cash Flow Elements [Abstract]      
Lease restructuring costs 209.9 8.7  
Change in operating lease right-of-use asset and lease liabilities 192.6 9.4  
Net cash activities for operating lease right-of-use asset and lease liabilities included in Other non-current assets and liabilities under Operating Activities $ 17.3 $ 0.7  
[1] Refunds of $124.2, $92.6 and $24.3 were received for the years ended December 31, 2020, 2019 and 2018, respectively.