Investments in Marketable Securities - Schedule of Investments in Marketable Securities (Details) $ in Millions	Mar. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 671.5
Gross Unrealized Gains	0.8
Gross Unrealized Losses	0.0
Fair Value	672.2
Restricted marketable securities	42.8
Total marketable securities	629.4
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	472.3
Gross Unrealized Gains	0.4
Gross Unrealized Losses	0.0
Fair Value	472.6
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	97.4
Gross Unrealized Gains	0.3
Gross Unrealized Losses	0.0
Fair Value	97.7
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	63.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	63.0
Supranational securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31.1
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	31.1
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7.8
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	$ 7.8

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