Revenue Recognition - Schedule Of Contract Assets And Liabilities (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	$ 0.1
Change in Contract With Customer, Asset [Roll Forward]
Balance as of December 31, 2018	4.0
Decrease due to transfer to receivables during the period	(1.0)
Balance as of March 31, 2019	3.1
Change in Contract With Customer, Liability [Roll Forward]
Balance as of December 31, 2018	77.4
Increase due to cash received	22.3
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance	(24.6)
Decrease due to amortization of deferred revenue that was added during the period	(1.4)
Balance as of March 31, 2019	$ 73.7

Change in Contract With Customer, Asset [Roll Forward]

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- Definition

Change in Contract With Customer, Liability [Roll Forward]

+ References

No definition available.

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- Definition

Contract with Customer, Liability, Increase from Cash Receipts

+ References

No definition available.

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- Definition

Contract with Customer, Liability, Revenue Recognized, Added During Period

+ References

No definition available.

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- Definition

Contract with Customer, Liability, Revenue Recognized, Included In Beginning Balance

+ References

No definition available.

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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045

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- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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- Definition

Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- References

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