Revenue Recognition (Deferred Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue Recognition [Abstract]
Balance at beginning of period	$ 107.1	$ 81.6	$ 59.9
New contracts sold	66.6	60.4	49.6
Balance at end of period	126.4	107.1	81.6
Deferred Revenue, Revenue Recognized	(47.3)	(34.9)	$ (27.9)
Deferred Revenue, Current	44.0	37.8
Deferred Revenue, Noncurrent	$ 82.4	$ 69.3

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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- Definition

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.

+ References

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- Definition

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.

+ References

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- Definition

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.

+ References

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- Definition

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

+ References

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- References

No definition available.

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