Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income Activity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 255.9	$ 268.3	$ 377.6	$ 391.0	$ 268.3	$ 391.0
Total other comprehensive income (loss)	1.6	0.1	(2.5)	2.9	1.7	0.4
Ending balance	251.8	255.9	339.5	377.6	251.8	339.5
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(0.5)		1.7	(0.5)	1.7
Other comprehensive (loss) income before reclassifications, net of tax impact					(0.9)	(0.6)
Amounts reclassified from accumulated other comprehensive income					0.0	0.0
Total other comprehensive income (loss)					(0.9)	(0.6)
Ending balance	(1.4)		1.1		(1.4)	1.1
AOCI, tax	0.0				0.0		$ 0.0
Derivative Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(0.6)		0.8	(0.6)	0.8
Other comprehensive (loss) income before reclassifications, net of tax impact					0.7	(0.4)
Amounts reclassified from accumulated other comprehensive income					(0.3)	(0.4)
Total other comprehensive income (loss)					0.4	(0.8)
Ending balance	(0.2)		0.0		(0.2)	0.0
AOCI, tax	(0.3)				(0.3)		0.2
Pension and Postretirement Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(73.6)		(64.1)	(73.6)	(64.1)
Other comprehensive (loss) income before reclassifications, net of tax impact					0.2	(0.8)
Amounts reclassified from accumulated other comprehensive income					2.0	2.6
Total other comprehensive income (loss)					2.2	1.8
Ending balance	(71.4)		(62.3)		(71.4)	(62.3)
AOCI, tax	0.0				0.0		0.0
Total Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(74.6)	(74.7)	(58.7)	(61.6)	(74.7)	(61.6)
Other comprehensive (loss) income before reclassifications, net of tax impact					0.0	(1.8)
Amounts reclassified from accumulated other comprehensive income					1.7	2.2
Total other comprehensive income (loss)	1.6	0.1	(2.5)	2.9	1.7	0.4
Ending balance	(73.0)	$ (74.6)	$ (61.2)	$ (58.7)	(73.0)	$ (61.2)
AOCI, tax	$ (0.3)				$ (0.3)		$ 0.2