Financial Instruments - Summary of Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	$ 1,367.6	$ 1,238.9
Gross unrealized gains	0.0	0.2
Gross Unrealized Losses	(2.0)	0.0
Fair Value	1,365.6	1,239.1
Debt Securities, Trading, and Equity Securities, FV-NI, Cost [Abstract]
Amortized Cost	227.8	227.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(90.4)	(109.6)
Fair Value	137.4	118.1
Corporate Debt Securities Current
Debt Securities, Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	418.2	246.8
Gross unrealized gains	0.0	0.0
Gross Unrealized Losses	(0.7)	0.0
Fair Value	417.5	246.8
Corporate debt securities, noncurrent
Debt Securities, Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	317.8	290.6
Gross unrealized gains	0.0	0.2
Gross Unrealized Losses	(1.1)	0.0
Fair Value	316.7	290.8
Government Securities Current
Debt Securities, Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	482.6	560.4
Gross unrealized gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Fair Value	482.5	560.4
Government securities, noncurrent
Debt Securities, Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	64.8	88.4
Gross unrealized gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	64.8	88.4
Mortgage and other asset backed securities, noncurrent
Debt Securities, Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	84.2	52.7
Gross unrealized gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Fair Value	84.1	52.7
Equity Securities, Non-Current
Debt Securities, Trading, and Equity Securities, FV-NI, Cost [Abstract]
Amortized Cost	227.8	227.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(90.4)	(109.6)
Fair Value	$ 137.4	$ 118.1