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Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract assets - current	$ 47.0		$ 47.0		$ 38.4
Contract assets - long-term	21.3		21.3		21.6
Deferred revenue - current	(197.4)		(197.4)		(246.4)
Deferred revenue - long-term	(122.5)		(122.5)		$ (147.0)
Revenue recognized that was included in deferred revenue at the beginning of the period	$ 48.1	$ 30.1	$ 197.3	$ 202.1

X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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+ References

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