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Fair Value Measurements - Reconciliation of Equity Securities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, beginning balance	$ 55.9
Purchases	0.0	$ 68.9	$ 0.0
Unrealized loss included in earnings	(17.7)	(13.0)	0.0
Equity securities, ending balance	38.2	55.9
Fair value measurements recurring | Equity securities–biotechnology industry | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, beginning balance	55.9	0.0	0.0
Purchases	0.0	68.9	0.0
Unrealized loss included in earnings	(17.7)	(13.0)	0.0
Equity securities, ending balance	$ 38.2	$ 55.9	$ 0.0

X

- Definition

Amount of restricted investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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-Publisher FASB
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-Section 50
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- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

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