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Fair Value Measurements - Fair Value of Financial Assets and Financial Liabilities (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Investments	$ 91.4	$ 91.7
Liabilities:
Derivative instruments	(87.0)	(165.9)
Level 1 [Member]
Assets:
Investments	91.4	91.7
Liabilities:
Derivative instruments	0	0
Level 2 [Member]
Assets:
Investments	0	0
Liabilities:
Derivative instruments	(87.0)	(165.9)
Level 3 [Member]
Assets:
Investments	0	0
Liabilities:
Derivative instruments	$ 0	$ 0

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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