Related Party Transactions - Summary Amounts Included in Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Accounts receivable, net of $0.1 million and $0.0 million allowance - related party	$ 36.3	$ 30.8
Accounts receivable, allowance - related party	4.6	2.8
Ascension
Related Party Transaction [Line Items]
Accounts receivable, net of $0.1 million and $0.0 million allowance - related party	36.3	30.8
Accounts receivable, allowance - related party	0.1	0.0
Current portion of customer liabilities	31.0	34.1
Non-current portion of customer liabilities	19.3	18.6
Total customer liabilities	$ 50.3	$ 52.7