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Contract Balances - Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Unbilled receivables	$ 241.7	$ 183.5
Contract liabilities - current	(1,012.0)	(840.8)
Deferred revenue - non-current	(43.1)	(33.2)
Net contract assets/(liabilities)	(813.4)	$ (690.5)
Change in unbilled receivables - current	58.2
Change in contract liabilities - current	(171.2)
Change in deferred revenue - non-current	(9.9)
Change in net contract assets/(liabilities)	$ (122.9)

X

- Definition

Contract With Customer, Asset, Net, Increase (Decrease)

+ References

No definition available.

+ Details

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X

- Definition

Contract With Customer, Liability, Current, Billings In-Excess Of Revenues, And Customer Deposits

+ References

No definition available.

+ Details

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X

- Definition

Contract With Customer, Liability, Noncurrent, Increase (Decrease)

+ References

No definition available.

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X

- Definition

Deferred Revenue, Billings In-Excess Of Revenues, And Customer Deposits, Increase (Decrease)

+ References

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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X

- Definition

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
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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- References

No definition available.

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- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

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