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Revenue Recognition Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018
Revenue Recognition [Abstract]
Receivables from contracts with customers, net	$ 625.4	$ 625.4	$ 854.3
Contract Asset (Current)	23.0	23.0	18.4
Contract Asset (Long-Term)	9.7	9.7	1.4
Contract Liability (Current)	30.3	30.3	26.7
Contract Liability (Long-Term)	64.0	64.0	$ 63.8
Amounts included in contract liability at the beginning of the period	7.4	14.9
Performance obligations satisfied in previous periods	$ 6.0	11.9
Contract assets reclassified to receivables		$ 8.3

X

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
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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

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+ References

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