Noncontrolling Interests in Consolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary financial statistics - statement of operations and cash flows, consolidated affiliates
Net sales	$ 776.7	$ 771.3	$ 802.8	$ 709.9	$ 797.8	$ 776.6	$ 826.7	$ 754.4	$ 3,060.7	$ 3,155.5	$ 3,211.9
Income (loss) before taxes									360.6	(20.6)	307.0
Net income (loss)									257.7	41.0	219.1
Noncontrolling interests in net income (loss)									1.6	1.0	(0.6)
Summary financial statistics - balance sheet information, consolidated affiliates
Other current assets	99.0				78.4				99.0	78.4
Assets	5,396.1				5,090.4				5,396.1	5,090.4	4,495.6
Total liabilities	4,824.9				4,770.6				4,824.9	4,770.6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	571.2				319.8				571.2	319.8	184.1	(55.7)
Noncontrolling interests in shareholders' equity	10.6				9.9				10.6	9.9
Joint ventures
Summary financial statistics - statement of operations and cash flows, consolidated affiliates
Net sales									101.5	108.8	86.3
Income (loss) before taxes									2.7	0.8	(0.1)
Net income (loss)									3.4	1.1	(0.9)
Noncontrolling interests in net income (loss)									1.6	1.0	(0.6)
Summary financial statistics - balance sheet information, consolidated affiliates
Cash	5.1				5.7				5.1	5.7	6.7
Other current assets	33.4				41.6				33.4	41.6	34.7
Assets	71.1				73.8				71.1	73.8	53.0
Total liabilities	48.9				46.1				48.9	46.1	30.1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	22.2				27.7				22.2	27.7	22.9
Noncontrolling interests in shareholders' equity	$ 10.6				$ 9.9				$ 10.6	$ 9.9	$ 8.1