Investments in and Advances to Affiliates Results for affiliates (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 458.7	$ 467.8	$ 427.8	$ 361.5	$ 312.2	$ 350.6	$ 362.4	$ 331.7	$ 1,715.8	$ 1,356.9	$ 1,383.6
Net income (loss)									28.8	(181.3)	(39.0)
Current assets	995.6				656.8				995.6	656.8
Total assets	2,331.0				2,139.9				2,331.0	2,139.9
Equity	1,033.8				1,000.9				1,033.8	1,000.9
Total liabilities and stockholders' equity	2,331.0				2,139.9				2,331.0	2,139.9
Equity Method Investee [Member]
Net sales									238.9	188.6	241.9
Net income (loss)									3.4	(53.7)	(12.8)
Current assets	54.5				50.0				54.5	50.0
Long term assets	146.8				168.9				146.8	168.9
Total assets	201.3				218.9				201.3	218.9
Total liabilities	41.4				41.4				41.4	41.4
Equity	159.9				177.5				159.9	177.5
Total liabilities and stockholders' equity	$ 201.3				$ 218.9				$ 201.3	$ 218.9