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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]    
Deferred revenue   $ 332.2
Deferred revenue recognized during period $ 217.8  
Current deferred revenue 374.3  
Noncurrent deferred revenue 1.8  
Amortization expense recognized related to contract cost assets 75.1  
Capitalization of costs incurred to obtain contract $ 68.0