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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | $ 376.2 |
Other comprehensive income (loss) before reclassifications |  | (11.1) | $ (11.9)
Reclassifications [Abstract] |  |  |
Reclassifications for amortization of unrecognized net loss | [1] | 5.2 | 48.3
Amortization of unrecognized prior service credit | [1] |  | (0.2)
Income taxes |  | (1.7) | (11.8)
Total other comprehensive income (loss) |  | (7.6) | 24.4
Ending balance |  | 414.0 | 376.2
Accumulated Other Comprehensive Income [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | (174.2) | (198.6)
Reclassifications [Abstract] |  |  |
Ending balance |  | (181.8) | (174.2)
Foreign Currency Translation [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | (36.0) | (40.7)
Other comprehensive income (loss) before reclassifications |  | (10.8) | 4.7
Reclassifications [Abstract] |  |  |
Reclassifications for amortization of unrecognized net loss | [1] | 0.0 | 0.0
Amortization of unrecognized prior service credit | [1] |  | 0.0
Income taxes |  | 0.0 | 0.0
Total other comprehensive income (loss) |  | (10.8) | 4.7
Ending balance |  | (46.8) | (36.0)
Defined Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | (138.2) | (157.9)
Other comprehensive income (loss) before reclassifications |  | (0.3) | (16.6)
Reclassifications [Abstract] |  |  |
Reclassifications for amortization of unrecognized net loss | [1] | 5.2 | 48.3
Amortization of unrecognized prior service credit | [1] |  | (0.2)
Income taxes |  | (1.7) | (11.8)
Total other comprehensive income (loss) |  | 3.2 | 19.7
Ending balance |  | $ (135.0) | $ (138.2)
[1] | Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 16 for additional information about the Company's pension plans.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + 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=66004124&loc=SL7669686-108580 + Details
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- Definition Amount before 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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: 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=66004124&loc=SL7669646-108580 Reference 3: 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=65897934&loc=d3e1928-114920 Reference 4: 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=66004124&loc=d3e637-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 + Details
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