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Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | $ (131.3) |  |  | $ (128.4) |  |
Other comprehensive income before reclassifications | 10.2 |  |  | 5.9 |  |
Reclassifications [Abstract] |  |  |  |  |  |
Total other comprehensive income | 11.5 |  | 6.9 | 8.6 |  | (10.3)
Ending balance | (119.8) |  |  | (119.8) |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Reclassifications [Abstract] |  |  |  |  |  |
Amortization of unrecognized net loss | 1.5 | [1] |  | 3.1 | [1] |
Amortization of unrecognized prior service credit | (0.3) | [1] |  | (0.6) | [1] |
Commodity derivatives | 0.1 | [2] |  | 0.2 | [2] |
Foreign Currency Translation [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | 13.5 |  |  | 17.8 |  |
Other comprehensive income before reclassifications | 10.2 |  |  | 5.9 |  |
Reclassifications [Abstract] |  |  |  |  |  |
Total other comprehensive income | 10.2 |  |  | 5.9 |  |
Ending balance | 23.7 |  |  | 23.7 |  |
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Reclassifications [Abstract] |  |  |  |  |  |
Amortization of unrecognized net loss | 0 | [1] |  | 0 | [1] |
Amortization of unrecognized prior service credit | 0 | [1] |  | 0 | [1] |
Commodity derivatives | 0 | [2] |  | 0 | [2] |
Cash Flow Hedges [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | (1.0) |  |  | (1.1) |  |
Other comprehensive income before reclassifications | 0 |  |  | 0 |  |
Reclassifications [Abstract] |  |  |  |  |  |
Total other comprehensive income | 0.1 |  |  | 0.2 |  |
Ending balance | (0.9) |  |  | (0.9) |  |
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Reclassifications [Abstract] |  |  |  |  |  |
Amortization of unrecognized net loss | 0 | [1] |  | 0 | [1] |
Amortization of unrecognized prior service credit | 0 | [1] |  | 0 | [1] |
Commodity derivatives | 0.1 | [2] |  | 0.2 | [2] |
Defined Benefit Plans [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning balance | (143.8) |  |  | (145.1) |  |
Other comprehensive income before reclassifications | 0 |  |  | 0 |  |
Reclassifications [Abstract] |  |  |  |  |  |
Total other comprehensive income | 1.2 |  |  | 2.5 |  |
Ending balance | (142.6) |  |  | (142.6) |  |
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Reclassifications [Abstract] |  |  |  |  |  |
Amortization of unrecognized net loss | 1.5 | [1] |  | 3.1 | [1] |
Amortization of unrecognized prior service credit | (0.3) | [1] |  | (0.6) | [1] |
Commodity derivatives | $ 0 | [2] |  | $ 0 | [2] |
[1] | Amounts are included in the calculation of net periodic benefit cost. See Note 5 for additional information.
[2] | Reclassifications for commodity derivatives are included in cost of sales.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 + Details
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