Other Current Liabilities - Summary of Other Current and Long-Term Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other current liabilities:
Salaries, wages and benefits	$ 100.0	$ 167.7
Forward starting interest rate swaps		59.3us-gaap_DerivativeLiabilitiesCurrent
Accrued liabilities	576.3us-gaap_AccruedLiabilitiesCurrent	571.5us-gaap_AccruedLiabilitiesCurrent
Total other current liabilities	$ 676.3us-gaap_OtherLiabilitiesCurrent	$ 798.5us-gaap_OtherLiabilitiesCurrent

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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