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Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Senior notes due 2018	Dec. 31, 2012 Senior notes due 2018	Feb. 03, 2010 Senior notes due 2018	Jun. 30, 2013 Senior notes 8.50% due 2020	Dec. 31, 2012 Senior notes 8.50% due 2020	Oct. 18, 2010 Senior notes 8.50% due 2020	Jun. 30, 2013 Senior notes 5.875% due 2022	Dec. 31, 2012 Senior notes 5.875% due 2022	Oct. 19, 2012 Senior notes 5.875% due 2022	Jun. 30, 2013 Term loan A	Dec. 31, 2012 Term loan A	Jun. 30, 2013 Term loan B	Dec. 31, 2012 Term loan B	Jun. 30, 2013 Fair value measurement on recurring basis Level 1	Dec. 31, 2012 Fair value measurement on recurring basis Level 1	Jun. 30, 2013 Fair value measurement on recurring basis Level 1 Foreign currency exchange contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 1 Foreign currency exchange contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 1 Commodity contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 1 Commodity contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 1 Interest rate swap contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 1 Interest rate swap contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 2	Dec. 31, 2012 Fair value measurement on recurring basis Level 2	Jun. 30, 2013 Fair value measurement on recurring basis Level 2 Foreign currency exchange contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 2 Foreign currency exchange contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 2 Commodity contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 2 Commodity contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 2 Interest rate swap contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 2 Interest rate swap contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 3	Dec. 31, 2012 Fair value measurement on recurring basis Level 3	Jun. 30, 2013 Fair value measurement on recurring basis Level 3 Foreign currency exchange contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 3 Foreign currency exchange contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 3 Commodity contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 3 Commodity contracts	Jun. 30, 2013 Fair value measurement on recurring basis Level 3 Interest rate swap contracts	Dec. 31, 2012 Fair value measurement on recurring basis Level 3 Interest rate swap contracts	Jun. 30, 2013 Fair value measurement on recurring basis Total	Dec. 31, 2012 Fair value measurement on recurring basis Total	Jun. 30, 2013 Fair value measurement on recurring basis Total Foreign currency exchange contracts	Dec. 31, 2012 Fair value measurement on recurring basis Total Foreign currency exchange contracts	Jun. 30, 2013 Fair value measurement on recurring basis Total Commodity contracts	Dec. 31, 2012 Fair value measurement on recurring basis Total Commodity contracts	Jun. 30, 2013 Fair value measurement on recurring basis Total Interest rate swap contracts	Dec. 31, 2012 Fair value measurement on recurring basis Total Interest rate swap contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Foreign currency exchange contracts																		$ 0	$ 0							$ 1.4	$ 2.9							$ 0	$ 0							$ 1.4	$ 2.9
Marketable securities	2.7	2.7														2.7	2.7							0	0							0	0							2.7	2.7
Total current assets	1,458.5	1,328.0														2.7	2.7							1.4	2.9							0	0							4.1	5.6
Derivative liabilities, current	4.3	1.9																0	0	0	0		0			2.9	0.9	1.4	0.8		0.3			0	0	0	0		0			2.9	0.9	1.4	0.8		0.3
Total current liabilities	1,110.1	1,145.9														0	0							4.3	2.0							0	0							4.3	2.0
Non-current derivative liabilities at fair value																						0	0							8.4	1.1							0	0							8.4	1.1
Total non-current liabilities	2,401.4	2,330.1														0	0							8.4	1.1							0	0							8.4	1.1
Interest rate, stated percentage (as a percent)					9.50%			8.50%			5.875%
Debt instruments at fair value			$ 433.8	$ 447.5		$ 657.0	$ 675.0		$ 301.5	$ 307.5		$ 275.9	$ 296.0	$ 75.5	$ 81.4