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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Liabilities
Net unrealized losses on equity securities	$ 61.6	$ 5.3
Increase in fair value of contingent consideration liability	1.7
Other income (expense), net
Liabilities
Net unrealized losses on equity securities	61.6	$ 5.3
Level 1
Assets
Equity securities	65.3		$ 126.9
Total assets	668.3		880.0
Liabilities
Contingent consideration	0.0		0.0
Total liabilities	0.0		0.0
Level 1 \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	0.0		0.0
Level 1 \| Corporate debt securities
Assets
Debt securities, available-for-sale	0.0		0.0
Level 1 \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	397.5		753.1
Level 1 \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	205.5		0.0
Level 2
Assets
Equity securities	0.0		0.0
Total assets	2,126.1		3,050.0
Liabilities
Contingent consideration	0.0		0.0
Total liabilities	0.0		0.0
Level 2 \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	1,722.7		2,443.2
Level 2 \| Corporate debt securities
Assets
Debt securities, available-for-sale	403.4		606.8
Level 2 \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0
Level 2 \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0
Level 3
Assets
Equity securities	0.0		0.0
Total assets	0.0		0.0
Liabilities
Contingent consideration	34.2		32.5
Total liabilities	34.2		32.5
Level 3 \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	0.0		0.0
Level 3 \| Corporate debt securities
Assets
Debt securities, available-for-sale	0.0		0.0
Level 3 \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0
Level 3 \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	0.0		0.0
Balance
Assets
Equity securities	65.3		126.9
Total assets	2,794.4		3,930.0
Liabilities
Contingent consideration	34.2		32.5
Total liabilities	34.2		32.5
Balance \| U.S. government and agency securities
Assets
Debt securities, available-for-sale	1,722.7		2,443.2
Balance \| Corporate debt securities
Assets
Debt securities, available-for-sale	403.4		606.8
Balance \| Money market funds
Assets
Cash and cash equivalents, fair value disclosure	397.5		753.1
Balance \| Time deposits
Assets
Cash and cash equivalents, fair value disclosure	$ 205.5		$ 0.0