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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

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