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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change in Contract with Customer, Liability [Abstract]    
Balance as of January 1 $ 215.8 $ 195.2
Revenue recognized (79.5) (79.9)
Revenue deferred 90.5 99.8
Acquired liabilities 0.6 0.7
Balance as of December 31 227.4 215.8
Change in Contract with Customer, Asset [Abstract]    
Balance as of December 31 44.7 $ 0.0
Adoption of ASC 606 22.8  
Revenue recognized and unbilled 163.3  
Revenue billed (141.4)  
Balance as of January 1 $ 0.0