Investments in Marketable Securities - Schedule of Investments in Marketable Securities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 992.7
Gross Unrealized Gains	0.3
Gross Unrealized Losses	(0.3)
Fair Value	992.7
Restricted marketable securities	38.4
Total marketable securities	954.3
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	449.3
Gross Unrealized Gains	0.1
Gross Unrealized Losses	(0.2)
Fair Value	449.1
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	265.2
Gross Unrealized Gains	0.1
Gross Unrealized Losses	0.0
Fair Value	265.4
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	122.3
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	122.3
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	110.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	(0.1)
Fair Value	109.9
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45.9
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	$ 46.0

Debt Securities, Available-for-sale, Excluding Restricted Securities

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