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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
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Net unrealized gain (loss) on equity securities			$ (48.2)	$ (9.3)
Increase in fair value of contingent consideration liability			4.9
Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Liabilities
Net unrealized gain (loss) on equity securities	$ 13.4	$ (4.0)	(48.2)	$ (9.3)
Level 1
Assets
Equity securities	78.7		78.7		$ 126.9
Total assets	970.1		970.1		880.0
Liabilities
Contingent consideration	0.0		0.0		0.0
Total liabilities	0.0		0.0		0.0
Level 1 \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	0.0		0.0		0.0
Level 1 \| Corporate debt securities
Assets
Debt securities, available-for-sale	0.0		0.0		0.0
Level 1 \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	684.0		684.0		753.1
Level 1 \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	207.4		207.4		0.0
Level 2
Assets
Equity securities	0.0		0.0		0.0
Total assets	1,921.5		1,921.5		3,050.0
Liabilities
Contingent consideration	0.0		0.0		0.0
Total liabilities	0.0		0.0		0.0
Level 2 \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	1,567.7		1,567.7		2,443.2
Level 2 \| Corporate debt securities
Assets
Debt securities, available-for-sale	353.8		353.8		606.8
Level 2 \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0		0.0
Level 2 \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0		0.0
Level 3
Assets
Equity securities	0.0		0.0		0.0
Total assets	0.0		0.0		0.0
Liabilities
Contingent consideration	37.4		37.4		32.5
Total liabilities	37.4		37.4		32.5
Level 3 \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	0.0		0.0		0.0
Level 3 \| Corporate debt securities
Assets
Debt securities, available-for-sale	0.0		0.0		0.0
Level 3 \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0		0.0
Level 3 \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0		0.0
Balance
Assets
Equity securities	78.7		78.7		126.9
Total assets	2,891.6		2,891.6		3,930.0
Liabilities
Contingent consideration	37.4		37.4		32.5
Total liabilities	37.4		37.4		32.5
Balance \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	1,567.7		1,567.7		2,443.2
Balance \| Corporate debt securities
Assets
Debt securities, available-for-sale	353.8		353.8		606.8
Balance \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	684.0		684.0		753.1
Balance \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	$ 207.4		$ 207.4		$ 0.0