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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	$ 226.9	$ 232.2	$ 199.7	$ 167.2	$ 215.6	$ 224.7	$ 197.2	$ 163.1	$ 826.0	$ 800.6	$ 793.4
Intangible Assets, Net (Including Goodwill)	439.3				434.6				439.3	434.6
Total assets	1,258.3				1,280.6				$ 1,258.3	1,280.6
Document Period End Date									Sep. 30, 2017
Property, plant and equipment, net	122.3				108.4				$ 122.3	108.4
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									732.0	716.5	700.9
Property, plant and equipment, net	116.1				103.3				116.1	103.3
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									62.3	57.1	62.2
Property, plant and equipment, net	3.0				2.1				3.0	2.1
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									31.7	27.0	$ 30.3
Property, plant and equipment, net	$ 3.2				$ 3.0				$ 3.2	$ 3.0

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