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Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period |  |  | $ 424.4 |
Balance at end of period | $ 508.7 |  | 508.7 |
Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | 1.6 | $ 1.7 | 1.7 | $ 1.7
Other comprehensive income (loss) |  |  | (0.1) |
Balance at end of period | 1.6 | 1.7 | 1.6 | 1.7
Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period |  | (0.8) |  | (1.2)
Other comprehensive income (loss) |  | (0.5) |  | (0.5)
Less reclassification adjustment for amounts included in interest expense |  | 0.2 |  | 0.6
Balance at end of period |  | (1.1) |  | (1.1)
Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (46.9) | (83.1) | (54.1) | (88.5)
Other comprehensive income (loss) | (16.7) | 9.3 | (9.5) | 14.7
Balance at end of period | (63.6) | (73.8) | (63.6) | (73.8)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (127.1) | (135.0) | (129.0) | (137.0)
Other comprehensive income (loss) | 1.9 | 0.6 | 3.8 | 2.6
Balance at end of period | (125.2) | (134.4) | (125.2) | (134.4)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | 2.2 | 2.9 | 2.4 | 3.1
Other comprehensive income (loss) | (0.2) | (0.2) | (0.4) | (0.4)
Balance at end of period | 2.0 | 2.7 | 2.0 | 2.7
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance at beginning of period | (170.2) | (214.3) | (179.0) | (221.9)
Other comprehensive income (loss) | (15.0) | 9.4 | (6.2) | 17.0
Balance at end of period | $ (185.2) | $ (204.9) | $ (185.2) | $ (204.9)

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