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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period |  |  | $ 200.9 |
Balance at end of period | $ 226.1 |  | 226.1 |
Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | 1.7 | $ 1.6 | 1.7 | $ 1.6
Other comprehensive income (loss) |  | 0.1 |  | 0.1
Balance at end of period | 1.7 | 1.7 | 1.7 | 1.7
Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (0.8) | (3.0) | (1.2) | (1.3)
Other comprehensive income (loss) | (0.5) | (0.8) | (0.5) | (2.8)
Less reclassification adjustment for amounts included in interest expense | 0.2 | 0.3 | 0.6 | 0.6
Balance at end of period | (1.1) | (3.5) | (1.1) | (3.5)
Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (83.1) | (69.4) | (88.5) | (78.1)
Other comprehensive income (loss) | 9.3 | (3.0) | 14.7 | 5.7
Balance at end of period | (73.8) | (72.4) | (73.8) | (72.4)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (135.0) | (121.1) | (137.0) | (123.0)
Other comprehensive income (loss) | 0.6 | 1.8 | 2.6 | 3.7
Balance at end of period | (134.4) | (119.3) | (134.4) | (119.3)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | 2.9 | 3.5 | 3.1 | 3.8
Other comprehensive income (loss) | (0.2) | (0.2) | (0.4) | (0.5)
Balance at end of period | 2.7 | 3.3 | 2.7 | 3.3
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (214.3) | (188.4) | (221.9) | (197.0)
Other comprehensive income (loss) | 9.4 | (1.8) | 17.0 | 6.8
Balance at end of period | $ (204.9) | $ (190.2) | $ (204.9) | $ (190.2)

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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=84161450&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=96868048&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=96868048&loc=SL4569643-111683 + Details
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