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Revenue Recognition - Contract Balances, Information About Receivables and Deferred Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Trade receivables, billed $ 21.3 $ 40.3
Unbilled accounts receivable, current 8.2 9.5
Unbilled accounts receivable, long term 10.6 10.6
Deferred revenue (contract liabilities) 26.1 $ 31.7
Revenue recognized that was included in deferred revenue $ 15.0