Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, Net, Current	$ 4.0	$ 3.0
Contract with Customer, Asset, Net, Noncurrent	0.0	2.8
Contract with Customer, Liability, Current	56.9	71.9
Contract with Customer, Liability, Noncurrent	20.5	$ 51.2
Change in Contract With Customer, Asset [Roll Forward]
Contract with Customer, Asset, Net	5.8
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	2.2
Contract with Customer, Asset, Reclassified to Receivable	(4.0)
Contract with Customer, Asset, Net	4.0
Change in Contract With Customer, Liability [Roll Forward]
Contract with Customer, Liability	123.1
Contract with Customer, Liability, Increase from Cash Receipts	49.4
Contract with Customer, Liability, Revenue Recognized, Included In Beginning Balance	(72.0)
Contract with Customer, Liability, Revenue Recognized, Added During Period	(23.1)
Contract with Customer, Liability	$ 77.4

Change in Contract With Customer, Asset [Roll Forward]

No definition available.

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Change in Contract With Customer, Liability [Roll Forward]

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Contract with Customer, Liability, Increase from Cash Receipts

+ References

No definition available.

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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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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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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.

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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.

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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.

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

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