Financial Information for Subsidiary and Guarantor Parent (B.S.) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 238.0	$ 269.5	$ 837.7	$ 1,026.8
Accounts receivable, net	690.9us-gaap_AccountsReceivableNetCurrent	603.6us-gaap_AccountsReceivableNetCurrent
Intercompany notes receivable	0	0
Inventories, net	1,472.6us-gaap_InventoryNet	1,472.8us-gaap_InventoryNet
Prepaid expenses and other current assets	64.1us-gaap_OtherAssetsCurrent	136.2us-gaap_OtherAssetsCurrent
Total current assets	2,465.6us-gaap_AssetsCurrent	2,482.1us-gaap_AssetsCurrent
Property, plant and equipment, net	2,943.7us-gaap_PropertyPlantAndEquipmentNet	2,961.8us-gaap_PropertyPlantAndEquipmentNet
Cost in excess of net assets acquired	777.9us-gaap_Goodwill	780.4us-gaap_Goodwill
Intercompany notes receivable	0	0
Investment in subsidiaries	0us-gaap_EquityMethodInvestments	0us-gaap_EquityMethodInvestments
Other assets	369.6us-gaap_OtherAssetsNoncurrent	358.3us-gaap_OtherAssetsNoncurrent
Total assets	6,556.8us-gaap_Assets	6,582.6us-gaap_Assets
LIABILITIES AND EQUITY
Accounts payable	559.5us-gaap_AccountsPayableCurrent	556.7us-gaap_AccountsPayableCurrent
Accrued liabilities	288.8us-gaap_AccruedLiabilitiesCurrent	323.2us-gaap_AccruedLiabilitiesCurrent
Intercompany notes payable	0	0
Deferred income taxes	70.8us-gaap_DeferredTaxLiabilitiesCurrent	62.2us-gaap_DeferredTaxLiabilitiesCurrent
Short-term debt and current portion of long-term debt	17.9us-gaap_DebtCurrent	17.8us-gaap_DebtCurrent
Total current liabilities	937.0us-gaap_LiabilitiesCurrent	959.9us-gaap_LiabilitiesCurrent
Long-term debt	1,509.1	1,509.1
Intercompany notes payable	0	0
Accrued postretirement benefits	407.1	415.8
Pension liabilities	730.2	739.3
Deferred income taxes	91.3	80.9
Other long-term liabilities	162.0us-gaap_OtherLiabilitiesNoncurrent	156.2us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	3,836.7us-gaap_Liabilities	3,861.2us-gaap_Liabilities
Redeemable noncontrolling interest	12.1	12.1
Total stockholders’ equity	2,708.0	2,709.3	2,967.1	2,994.7
Total Liabilities and Equity	6,556.8	6,582.6
Parent Company
ASSETS
Cash and cash equivalents	2.5	2.2
Accounts receivable, net	0.1	0.1
Intercompany notes receivable	0	0
Inventories, net	0	0
Prepaid expenses and other current assets	3.0	63.7
Total current assets	5.6	66.0
Property, plant and equipment, net	2.5	2.2
Cost in excess of net assets acquired	0	0
Intercompany notes receivable	0	0
Investment in subsidiaries	6,149.2	6,149.4
Other assets	23.5	23.7
Total assets	6,180.8	6,241.3
LIABILITIES AND EQUITY
Accounts payable	2.8	4.5
Accrued liabilities	31.7	47.5
Intercompany notes payable	1,179.0	1,232.6
Deferred income taxes	70.8	62.2
Short-term debt and current portion of long-term debt	0.6	0.5
Total current liabilities	1,284.9	1,347.3
Long-term debt	1,351.0	1,350.6
Intercompany notes payable	0	0
Accrued postretirement benefits	0	0
Pension liabilities	668.7	675.5
Deferred income taxes	91.3	80.9
Other long-term liabilities	76.9	77.7
Total liabilities	3,472.8	3,532.0
Redeemable noncontrolling interest	0	0
Total stockholders’ equity	2,708.0	2,709.3
Total Liabilities and Equity	6,180.8	6,241.3
Subsidiaries
ASSETS
Cash and cash equivalents	12.0	13.8
Accounts receivable, net	222.4	209.1
Intercompany notes receivable	0	0
Inventories, net	399.6	387.7
Prepaid expenses and other current assets	8.9	13.2
Total current assets	642.9	623.8
Property, plant and equipment, net	1,544.9	1,545.1
Cost in excess of net assets acquired	126.6	126.6
Intercompany notes receivable	0	0
Investment in subsidiaries	37.7	37.7
Other assets	27.7	28.0
Total assets	2,379.8	2,361.2
LIABILITIES AND EQUITY
Accounts payable	336.9	302.0
Accrued liabilities	60.3	72.0
Intercompany notes payable	1,188.9	1,158.2
Deferred income taxes	0	0
Short-term debt and current portion of long-term debt	0.1	0.1
Total current liabilities	1,586.2	1,532.3
Long-term debt	150.3	150.3
Intercompany notes payable	200.0	200.0
Accrued postretirement benefits	150.9	153.0
Pension liabilities	5.8	6.0
Deferred income taxes	0	0
Other long-term liabilities	20.9	22.5
Total liabilities	2,114.1	2,064.1
Redeemable noncontrolling interest	0	0
Total stockholders’ equity	265.7	297.1
Total Liabilities and Equity	2,379.8	2,361.2
NonGuarantor Subsidiaries
ASSETS
Cash and cash equivalents	223.5	253.5
Accounts receivable, net	468.4	394.4
Intercompany notes receivable	2,367.9	2,390.8
Inventories, net	1,073.0	1,085.1
Prepaid expenses and other current assets	52.2	59.3
Total current assets	4,185.0	4,183.1
Property, plant and equipment, net	1,396.3	1,414.5
Cost in excess of net assets acquired	651.3	653.8
Intercompany notes receivable	200.0	200.0
Investment in subsidiaries	0	0
Other assets	318.4	306.6
Total assets	6,751.0	6,758.0
LIABILITIES AND EQUITY
Accounts payable	219.8	250.2
Accrued liabilities	196.8	203.7
Intercompany notes payable	0	0
Deferred income taxes	0	0
Short-term debt and current portion of long-term debt	17.2	17.2
Total current liabilities	433.8	471.1
Long-term debt	7.8	8.2
Intercompany notes payable	0	0
Accrued postretirement benefits	256.2	262.8
Pension liabilities	55.7	57.8
Deferred income taxes	0	0
Other long-term liabilities	64.2	56.0
Total liabilities	817.7	855.9
Redeemable noncontrolling interest	12.1	12.1
Total stockholders’ equity	5,921.2	5,890.0
Total Liabilities and Equity	6,751.0	6,758.0
Consolidation Eliminations
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany notes receivable	(2,367.9)	(2,390.8)
Inventories, net	0	0
Prepaid expenses and other current assets	0	0
Total current assets	(2,367.9)	(2,390.8)
Property, plant and equipment, net	0	0
Cost in excess of net assets acquired	0	0
Intercompany notes receivable	(200.0)	(200.0)
Investment in subsidiaries	(6,186.9)	(6,187.1)
Other assets	0	0
Total assets	(8,754.8)	(8,777.9)
LIABILITIES AND EQUITY
Accounts payable	0	0
Accrued liabilities	0	0
Intercompany notes payable	(2,367.9)	(2,390.8)
Deferred income taxes	0	0
Short-term debt and current portion of long-term debt	0	0
Total current liabilities	(2,367.9)	(2,390.8)
Long-term debt	0	0
Intercompany notes payable	(200.0)	(200.0)
Accrued postretirement benefits	0	0
Pension liabilities	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	(2,567.9)	(2,590.8)
Redeemable noncontrolling interest	0	0
Total stockholders’ equity	(6,186.9)	(6,187.1)
Total Liabilities and Equity	$ (8,754.8)	$ (8,777.9)

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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