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Revenue Recognition - Contract Balances, Information About Receivables and Deferred Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Trade receivables, billed $ 27.5 $ 27.5 $ 40.3
Unbilled accounts receivable, current 6.9 6.9 9.5
Unbilled accounts receivable, long term 10.6 10.6 10.6
Deferred revenue (contract liabilities) 22.6 22.6 $ 31.7
Revenue recognized that was included in deferred revenue $ 8.6 $ 27.9