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Summary of Significant Accounting Policies - Impact of Adoption of ASUs on Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
ASSETS    
Trade and other receivables, net $ 68.8 $ 63.9
Prepaid expenses and other current assets 55.3 48.9
Other assets 96.0 94.4
LIABILITIES    
Deferred revenue 23.0 23.2
Other liabilities $ 42.7 45.9
Accounting Standards Update 2014-09 [Member] | As Previously Reported [Member]    
ASSETS    
Trade and other receivables, net   69.9
Prepaid expenses and other current assets   42.3
Other assets   1.6
LIABILITIES    
Deferred revenue   17.2
Other liabilities   42.0
Accounting Standards Update 2014-09 [Member] | ASU Adjustments [Member]    
ASSETS    
Trade and other receivables, net   (6.0)
Prepaid expenses and other current assets   6.6
Other assets   92.8
LIABILITIES    
Deferred revenue   6.0
Other liabilities   $ 3.9