Related Party Transactions - Summary Amounts Included in Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Accounts receivable, net - related party	$ 45.8	$ 55.2
Related Party
Related Party Transaction [Line Items]
Accounts receivable, net - related party	45.8	55.2
Current portion of customer liabilities	34.6	51.1
Non-current portion of customer liabilities	17.8	17.7
Total customer liabilities	$ 52.4	$ 68.8

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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Name:	us-gaap_AccountsReceivableRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant