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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, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 254.3	$ 250.2	$ 233.2	$ 178.3	$ 226.9	$ 232.2	$ 199.7	$ 167.2	$ 916.0	$ 826.0	$ 800.6
Intangible Assets, Net (Including Goodwill)	420.2				439.3				420.2	439.3
Total assets	1,291.9				1,258.3				$ 1,291.9	1,258.3
Document Period End Date									Sep. 30, 2018
Property, plant and equipment, net	150.9				122.3				$ 150.9	122.3
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									812.2	732.0	716.5
Property, plant and equipment, net	144.8				116.1				144.8	116.1
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									71.7	62.3	57.1
Property, plant and equipment, net	3.4				3.0				3.4	3.0
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									32.1	31.7	$ 27.0
Property, plant and equipment, net	$ 2.7				$ 3.2				$ 2.7	$ 3.2

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