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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (85.5) |  | $ (85.5) |  |  | $ (92.0) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 394.1 | $ 405.6 |  |  |  |
Net current-period other comprehensive income (loss) | 5.1 | $ (1.1) | 6.5 | 9.7 |  |  |  |
Ending Balance | 412.4 | 396.0 | 412.4 | 396.0 |  |  |  |
Actuarial Losses |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (78.9) | (71.8) | (78.9) | (71.8) | $ (78.8) | (79.0) | $ (73.8) | $ (75.6)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive (loss) income before reclassifications | (0.6) | 1.0 | (0.9) | 1.4 |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.5 | 1.0 | 1.0 | 2.4 |  |  |  |
Net current-period other comprehensive income (loss) | (0.1) | 2.0 | 0.1 | 3.8 |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (6.8) | (7.3) | (6.8) | (7.3) | (11.8) | (13.0) | (4.2) | (13.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive (loss) income before reclassifications | 5.0 | (2.8) | 6.2 | (1.4) |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | (0.3) | 0.0 | 7.4 |  |  |  |
Net current-period other comprehensive income (loss) | 5.0 | (3.1) | 6.2 | 6.0 |  |  |  |
Unrealized Gain on Derivatives |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive (loss) income before reclassifications | 0.2 | 0.0 | 0.2 | 0.0 |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | (0.1) |  |  |  |
Net current-period other comprehensive income (loss) | 0.2 | 0.0 | 0.2 | (0.1) |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (85.5) | (79.1) | (85.5) | (79.1) | $ (90.6) | $ (92.0) | $ (78.0) | $ (88.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance |  |  | (92.0) | (88.8) |  |  |  |
Other comprehensive (loss) income before reclassifications | 4.6 | (1.8) | 5.5 | 0.0 |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.5 | 0.7 | 1.0 | 9.7 |  |  |  |
Net current-period other comprehensive income (loss) | 5.1 | (1.1) | 6.5 | 9.7 |  |  |  |
Ending Balance | $ (85.5) | (79.1) | $ (85.5) | (79.1) |  |  |  |
Bronto |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Actuarial loss |  |  |  | 0.4 |  |  |  |
Fire Rescue | Foreign Currency Translation |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss |  | $ (0.3) |  | $ 7.4 |  |  |  |

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