Summary of Debt Obligations (Table Footnotes) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Line Items]
Liabilities of businesses held for sale	$ 0.0	$ 694.8
2018	2,024.6
2019	2,121.2
2020	2,432.3
2021	1,717.0
2021	2,311.2
Thereafter	19,056.8
Reclassification to Long Term Debt	2,000.0
Amounts outstanding	$ 29,536.4	$ 25,955.7

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Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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