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Revenue Recognition - Change in Contract Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 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 179.6 118.6
Revenue billed (161.0) (92.3)
Balance, ending $ 63.3 $ 49.1