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Revenue Recognition - Change in Contract Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]    
Balance, beginning $ 227.4 $ 215.8
Revenue recognized (30.2) (31.2)
Revenue deferred 35.3 39.6
Acquired liabilities 2.7 0.2
Balance, ending $ 235.2 $ 224.4