Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 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)	$ 0.4		$ (0.2)	10.1	(5.3)
Ending Balance	401.5		399.2	401.5	399.2
Actuarial loss		0.4
Actuarial Losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(71.8)	(75.6)	(77.6)	(75.6)	(79.8)
Other comprehensive income (loss) before reclassifications	0.3		0.6	1.7	0.4
Amounts reclassified from accumulated other comprehensive loss	1.0		1.2	3.4	3.6
Net current-period other comprehensive income (loss)	1.3		1.8	5.1	4.0
Ending Balance	(70.5)		(75.8)	(70.5)	(75.8)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(7.3)	(13.3)	(7.1)	(13.3)	0.2
Other comprehensive income (loss) before reclassifications	(0.9)		(2.0)	(2.3)	(9.3)
Amounts reclassified from accumulated other comprehensive loss	0.0		0.0	7.4	0.0
Net current-period other comprehensive income (loss)	(0.9)		(2.0)	5.1	(9.3)
Ending Balance	(8.2)		(9.1)	(8.2)	(9.1)
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		0.1	0.0	0.1
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(79.1)	$ (88.8)	(84.6)	(88.8)	(79.5)
Other comprehensive income (loss) before reclassifications	(0.6)		(1.4)	(0.6)	(8.9)
Amounts reclassified from accumulated other comprehensive loss	1.0		1.2	10.7	3.6
Net current-period other comprehensive income (loss)	0.4		(0.2)	10.1	(5.3)
Ending Balance	$ (78.7)		$ (84.8)	(78.7)	$ (84.8)
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				$ 7.1

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The amount of gains or losses recognized in net periodic benefit cost.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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.

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