Acquisitions, Litigation, and Other Charges Acquisitions, Litigation, and Other Charges - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) employee	Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Accelerated equity award vesting	$ 3.1	$ 3.1
Former Executives
Restructuring Cost and Reserve [Line Items]
Severance	$ 1.2
Number of departed executives \| employee	2

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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