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Effect of New Accounting Pronouncements - Summary of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
[1]
Dec. 31, 2016
Dec. 31, 2015
[1]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]        
Cash and cash equivalents $ 607.2 $ 681.2 $ 545.5  
Restricted cash 1,629.6 1,623.8 1,392.1  
Total cash, cash equivalents and restricted cash $ 2,236.8 $ 2,305.0 $ 1,937.6 [1] $ 1,892.5
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.