Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012
Commodity derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Liabilities	$ 0.4
Currency Derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	2.0
Liabilities	4.3
Interest Rate Swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	3.5
Fair Value, Measurements, Recurring [Member] | Commodity derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Liabilities	0.4
Fair Value, Measurements, Recurring [Member] | Currency Derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	2.0
Liabilities	4.3
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	3.5
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Liabilities	0.4
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Currency Derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	0
Liabilities	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Liabilities	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Currency Derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	2.0
Liabilities	4.3
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	3.5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Liabilities	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Currency Derivatives [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	0
Liabilities	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis
Assets	$ 0