Derivative Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair value of outstanding derivatives
Asset derivatives	$ 1.7	$ 1.5
Derivative liabilities	12.3	18.8
Liability derivatives	15.4	18.8
Designated as a hedging instrument
Fair value of outstanding derivatives
Asset derivatives	1.6	1.4
Liability derivatives	7.2	7.7
Designated as a hedging instrument | Foreign exchange contracts
Fair value of outstanding derivatives
Current derivative assets	1.5	0.6
Derivative liabilities	2.5	5.2
Designated as a hedging instrument | Interest rate swap contracts - Fixed-to-float/Float-to-fixed
Fair value of outstanding derivatives
Non-current derivative assets		0.5
Derivative liabilities	3.1
Designated as a hedging instrument | Commodity contracts
Fair value of outstanding derivatives
Derivative liabilities	1.6	2.5
Designated as a hedging instrument | Interest rate cap contracts
Fair value of outstanding derivatives
Non-current derivative assets	0.1	0.3
Not designated as hedging instruments
Fair value of outstanding derivatives
Asset derivatives	0.1	0.1
Liability derivatives	8.2	11.1
Not designated as hedging instruments | Foreign exchange contracts
Fair value of outstanding derivatives
Current derivative assets	0.1	0.1
Derivative liabilities	0.9	1.6
Not designated as hedging instruments | Interest rate swap contracts - Fixed-to-float/Float-to-fixed
Fair value of outstanding derivatives
Derivative liabilities	$ 7.3	$ 9.5