Basis of Presentation and Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	$ 112.0	$ 107.4	$ 112.0	$ 107.4	$ 113.6	$ 108.3	$ 105.5	$ 89.1
New contracts sold	10.7	10.7	38.5	43.3
Less: reductions for revenue recognized	(12.3)	(8.8)	(34.8)	(25.0)
Deferred revenue, current	35.8	34.4	35.8	34.4
Deferred revenue, noncurrent	$ 76.2	$ 73.0	$ 76.2	$ 73.0

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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