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Revenue Recognition - Change in Contract Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]    
Balance, beginning $ 227.4 $ 215.8
Revenue recognized (48.6) (53.7)
Revenue deferred 61.5 64.9
Acquired liabilities 1.1 0.3
Balance, ending $ 241.4 $ 227.3