Acquisitions - General Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017	Nov. 28, 2016
Business Acquisition [Line Items]
Amortization of acquired intangible assets		$ 11.1	$ 8.4
4titude Limited
Business Acquisition [Line Items]
Actual revenues	$ 4.3	7.8
Actual net income (loss)		(1.2)
Inventory step up		1.2
Amortization of acquired intangible assets	1.0	2.1
PBMMI and Novare
Business Acquisition [Line Items]
Actual revenues	2.5	4.8
Actual net income (loss)		(0.1)
Amortization of acquired intangible assets	0.4	0.8
Cool Lab, LLC
Business Acquisition [Line Items]
Liabilities arising from contingencies, amount recognized	0.8	0.8		$ 0.7	$ 0.7
Actual revenues	0.6	1.6
Actual net income (loss)	(0.2)	(0.2)
Amortization of acquired intangible assets	0.4	0.8
Selling, General and Administrative Expenses | 4titude Limited
Business Acquisition [Line Items]
Acquisition related costs	0.5	$ 1.0
Maximum | 4titude Limited
Business Acquisition [Line Items]
Actual net income (loss)	(0.1)
Maximum | PBMMI and Novare
Business Acquisition [Line Items]
Actual net income (loss)	$ (0.1)