Financial Information for Subsidiary and Guarantor Parent (B.S.) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 535.7	$ 304.6	$ 281.0	$ 380.6
Accounts receivable, net	576.9	613.3
Intercompany notes receivable	0	0
Inventories, net	1,344.9	1,536.6
Prepaid expenses and other current assets	120.6	56.1
Current assets of discontinued operations	115.4	0
Total current assets	2,693.5	2,510.6
Property, plant and equipment, net	2,744.7	2,559.9
Cost in excess of net assets acquired	728.1	740.1
Deferred income taxes	0	71.5
Intercompany notes receivable	0	0
Investment in subsidiaries	0	0
Other assets	348.0	365.7
Non-current assets of discontinued operations	85.0	0
Total assets	6,599.3	6,247.8
LIABILITIES AND EQUITY
Accounts payable	401.9	499.9
Accrued liabilities	304.9	330.5
Intercompany notes payable	0	0
Deferred income taxes	8.2	24.0
Short-term debt and current portion of long-term debt	419.9	17.1
Current liabilities of discontinued operations	33.7	0
Total current liabilities	1,168.6	871.5
Long-term debt	1,542.2	1,463.0
Intercompany notes payable	0
Accrued postretirement benefits	475.0	495.2
Pension liabilities	702.4	721.1
Deferred income taxes	52.1	0
Other long-term liabilities	94.9	109.9
Total liabilities	4,035.2	3,660.7
Total stockholders’ equity	2,564.1	2,587.1	2,744.9	2,571.6
Total Liabilities and Equity	6,599.3	6,247.8
Parent Company
ASSETS
Cash and cash equivalents	2.6	5.5
Accounts receivable, net	3.4	0.4
Intercompany notes receivable	0	0
Inventories, net	0	0
Prepaid expenses and other current assets	82.9	1.1
Current assets of discontinued operations	0
Total current assets	88.9	7.0
Property, plant and equipment, net	3.2	3.9
Cost in excess of net assets acquired	0	0
Deferred income taxes		71.5
Intercompany notes receivable	0	0
Investment in subsidiaries	5,605.5	5,545.4
Other assets	39.5	50.5
Non-current assets of discontinued operations	0
Total assets	5,737.1	5,678.3
LIABILITIES AND EQUITY
Accounts payable	4.6	5.3
Accrued liabilities	46.9	64.0
Intercompany notes payable	664.5	1,073.4
Deferred income taxes	8.2	24.0
Short-term debt and current portion of long-term debt	402.9	0.3
Current liabilities of discontinued operations	0
Total current liabilities	1,127.1	1,167.0
Long-term debt	1,350.9	1,253.4
Intercompany notes payable	0	0
Accrued postretirement benefits	0	0
Pension liabilities	638.1	651.7
Deferred income taxes	52.1
Other long-term liabilities	4.8	19.1
Total liabilities	3,173.0	3,091.2
Total stockholders’ equity	2,564.1	2,587.1
Total Liabilities and Equity	5,737.1	5,678.3
Subsidiaries
ASSETS
Cash and cash equivalents	7.3	13.1
Accounts receivable, net	187.5	190.1
Intercompany notes receivable	0	0
Inventories, net	267.1	311.1
Prepaid expenses and other current assets	9.3	10.2
Current assets of discontinued operations	0
Total current assets	471.2	524.5
Property, plant and equipment, net	1,211.8	882.2
Cost in excess of net assets acquired	112.1	112.1
Deferred income taxes		0
Intercompany notes receivable	0	0
Investment in subsidiaries	37.7	33.7
Other assets	31.3	35.5
Non-current assets of discontinued operations	0
Total assets	1,864.1	1,588.0
LIABILITIES AND EQUITY
Accounts payable	230.8	262.6
Accrued liabilities	57.0	62.2
Intercompany notes payable	596.9	216.5
Deferred income taxes	0	0
Short-term debt and current portion of long-term debt	0.1	0.1
Current liabilities of discontinued operations	0
Total current liabilities	884.8	541.4
Long-term debt	150.5	150.5
Intercompany notes payable	200.0	200.1
Accrued postretirement benefits	183.1	198.2
Pension liabilities	4.7	5.1
Deferred income taxes	0
Other long-term liabilities	19.3	20.8
Total liabilities	1,442.4	1,116.1
Total stockholders’ equity	421.7	471.9
Total Liabilities and Equity	1,864.1	1,588.0
NonGuarantor Subsidiaries
ASSETS
Cash and cash equivalents	525.8	286.0
Accounts receivable, net	386.0	422.8
Intercompany notes receivable	1,261.4	1,289.9
Inventories, net	1,077.8	1,225.5
Prepaid expenses and other current assets	28.4	44.8
Current assets of discontinued operations	115.4
Total current assets	3,394.8	3,269.0
Property, plant and equipment, net	1,529.7	1,673.8
Cost in excess of net assets acquired	616.0	628.0
Deferred income taxes		0
Intercompany notes receivable	200.0	200.1
Investment in subsidiaries	0	0
Other assets	277.2	279.7
Non-current assets of discontinued operations	85.0
Total assets	6,102.7	6,050.6
LIABILITIES AND EQUITY
Accounts payable	166.5	232.0
Accrued liabilities	201.0	204.3
Intercompany notes payable	0	0
Deferred income taxes	0	0
Short-term debt and current portion of long-term debt	16.9	16.7
Current liabilities of discontinued operations	33.7
Total current liabilities	418.1	453.0
Long-term debt	40.8	59.1
Intercompany notes payable	0	0
Accrued postretirement benefits	291.9	297.0
Pension liabilities	59.6	64.3
Deferred income taxes	0
Other long-term liabilities	70.8	70.0
Total liabilities	881.2	943.4
Total stockholders’ equity	5,221.5	5,107.2
Total Liabilities and Equity	6,102.7	6,050.6
Consolidation Eliminations
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net		0
Intercompany notes receivable	(1,261.4)	(1,289.9)
Inventories, net	0	0
Prepaid expenses and other current assets	0	0
Current assets of discontinued operations	0
Total current assets	(1,261.4)	(1,289.9)
Property, plant and equipment, net	0	0
Cost in excess of net assets acquired	0	0
Deferred income taxes		0
Intercompany notes receivable	(200.0)	(200.1)
Investment in subsidiaries	(5,643.2)	(5,579.1)
Other assets	0	0
Non-current assets of discontinued operations	0
Total assets	(7,104.6)	(7,069.1)
LIABILITIES AND EQUITY
Accounts payable	0	0
Accrued liabilities	0	0
Intercompany notes payable	(1,261.4)	(1,289.9)
Deferred income taxes	0	0
Short-term debt and current portion of long-term debt	0	0
Current liabilities of discontinued operations	0
Total current liabilities	(1,261.4)	(1,289.9)
Long-term debt	0	0
Intercompany notes payable	(200.0)	(200.1)
Accrued postretirement benefits	0	0
Pension liabilities	0	0
Deferred income taxes	0
Other long-term liabilities	0	0
Total liabilities	(1,461.4)	(1,490.0)
Total stockholders’ equity	(5,643.2)	(5,579.1)
Total Liabilities and Equity	$ (7,104.6)	$ (7,069.1)