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Revenue Recognition - Change in Contract Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]    
Balance, beginning $ 44.7 $ 0.0
Adoption of ASC 606 0.0 22.8
Revenue recognized and unbilled 58.1 33.8
Revenue billed (44.7) 22.8
Balance, ending $ 58.1 $ 33.8