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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 405.6 |  | $ 405.6 | $ 371.6
Net current-period other comprehensive income (loss) | $ (1.1) |  | $ 4.9 | 9.7 | (5.1)
Ending Balance | 396.0 |  | 388.0 | 396.0 | 388.0
Actuarial loss |  | 0.4 |  |  |
Actuarial Losses |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (73.8) | (75.6) | (77.9) | (75.6) | (79.8)
Other comprehensive income (loss) before reclassifications | 1.0 |  | (1.0) | 1.4 | (0.2)
Amounts reclassified from accumulated other comprehensive loss | 1.0 |  | 1.3 | 2.4 | 2.4
Net current-period other comprehensive income (loss) | 2.0 |  | 0.3 | 3.8 | 2.2
Ending Balance | (71.8) | (73.8) | (77.6) | (71.8) | (77.6)
Foreign Currency Translation |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (4.2) | (13.3) | (11.7) | (13.3) | 0.2
Other comprehensive income (loss) before reclassifications | (2.8) |  | 4.6 | (1.4) | (7.3)
Amounts reclassified from accumulated other comprehensive loss | (0.3) |  | 0.0 | 7.4 | 0.0
Net current-period other comprehensive income (loss) | (3.1) |  | 4.6 | 6.0 | (7.3)
Ending Balance | (7.3) | (4.2) | (7.1) | (7.3) | (7.1)
Unrealized Gain on Derivatives |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | 0.0 | 0.1 | 0.1 | 0.1 | 0.1
Other comprehensive income (loss) before reclassifications | 0.0 |  | 0.0 | 0.0 | 0.0
Amounts reclassified from accumulated other comprehensive loss | 0.0 |  | 0.0 | (0.1) | 0.0
Net current-period other comprehensive income (loss) | 0.0 |  | 0.0 | (0.1) | 0.0
Ending Balance | 0.0 | 0.0 | 0.1 | 0.0 | 0.1
Accumulated Other Comprehensive Loss |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning Balance | (78.0) | (88.8) | (89.5) | (88.8) | (79.5)
Other comprehensive income (loss) before reclassifications | (1.8) |  | 3.6 | 0.0 | (7.5)
Amounts reclassified from accumulated other comprehensive loss | 0.7 |  | 1.3 | 9.7 | 2.4
Net current-period other comprehensive income (loss) | (1.1) |  | 4.9 | 9.7 | (5.1)
Ending Balance | (79.1) | $ (78.0) | $ (84.6) | (79.1) | $ (84.6)
Bronto |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Actuarial loss |  |  |  | 0.4 |
Fire Rescue |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Foreign currency translation loss | $ (0.3) |  |  | $ 7.4 |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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