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Fair Value Measurements - Fair Value of Financial Assets and Financial Liabilities (Detail) (USD $)
In Millions, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

$ 99.6

$ 114.2

Balance [Member] | Fair Value, Measurements, Recurring [Member]

99.6

114.2

Derivative instruments

0

^[1]

0

^[1]

Liabilities:

Derivative instruments

(203.0)

(306.4)

Level 1 [Member] | Fair Value, Measurements, Recurring [Member]

99.6

114.2

Derivative instruments

0

0

Liabilities:

Derivative instruments

0

0

Level 2 [Member] | Fair Value, Measurements, Recurring [Member]

0

0

Derivative instruments

0

^[1]

0

^[1]

Liabilities:

Derivative instruments

(203.0)

(306.4)

Level 3 [Member] | Fair Value, Measurements, Recurring [Member]

0

0

Derivative instruments

0

0

Liabilities:

Derivative instruments

$ 0

$ 0

[1]	Amount rounds to zero

Fair value, after the effects of master netting arrangements, of a financial asset or other 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.

+ References+ Details

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.

+ References+ Details