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Effect of New Accounting Pronouncements - Summary of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017		Jun. 30, 2017		Dec. 31, 2016	[1]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Cash and cash equivalents	$ 652.2	$ 681.2	[1]	$ 587.8
Restricted cash	1,692.5	1,623.8	[1]	1,481.1
Total cash, cash equivalents and restricted cash	$ 2,344.7	$ 2,305.0		$ 2,068.9	[1]	$ 1,937.6
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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