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Change in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (88.8)	$ (79.5)
Other comprehensive income (loss) before reclassifications	(14.9)	(14.1)
Amounts reclassified from accumulated other comprehensive income (loss)	11.7	4.8
Net current-period other comprehensive income (loss)	(3.2)	(9.3)
Ending balance	(92.0)	(88.8)
Actuarial Losses [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(75.6)	(79.8)
Other comprehensive income (loss) before reclassifications	(7.8)	(0.6)
Amounts reclassified from accumulated other comprehensive income (loss)	4.4	4.8
Net current-period other comprehensive income (loss)	(3.4)	4.2
Ending balance	(79.0)	(75.6)
Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(13.3)	0.2
Other comprehensive income (loss) before reclassifications	(7.1)	(13.5)
Amounts reclassified from accumulated other comprehensive income (loss)	7.4	0.0
Net current-period other comprehensive income (loss)	0.3	(13.5)
Ending balance	(13.0)	(13.3)
Unrealized Gain (Loss) on Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0.1	0.1
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.1)	0.0
Net current-period other comprehensive income (loss)	(0.1)	0.0
Ending balance	0.0	$ 0.1
Bronto [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined Benefit Plan, Amortization of Gains (Losses)	(0.4)
Fire Rescue [Member] | Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Ending balance	$ (7.4)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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