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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Deferred costs associated with deferred revenue		$ 144.1	$ 144.1
Provision for Loss on Contracts		15.3
Loss on contracts	$ 0.0
Deferred revenue		243.0	243.0
Advances from customers, current		0.0	23.3
Advances from customer, noncurrent		29.4	29.4
Government [Member]
Provision for Loss on Contracts		9.7	10.0
Provision for loss on contracts, noncurrent		$ 5.6	$ 8.3

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Advances from customers, current

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044

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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.

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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))
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Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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