Additional Balance Sheet Detail - Additional Cash Flow (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 6,795.0	$ 5,988.2	$ 3,109.3	$ 2,650.1
Cash, cash equivalents and restricted cash per consolidated statement of cash flows	6,800.1	5,988.9	3,120.7	2,658.3
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	5.1	0.7	8.0	4.9
Other assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 0.0	$ 0.0	$ 3.4	$ 3.3