Acquisitions - Intangible Assets and Amortization Periods (Details) - Altek - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Total identifiable intangible assets of Altek	$ 52.7	$ 52.7	$ 52.5
Measurement Period Adjustments	0.2
Customer related
Business Acquisition [Line Items]
Amortization Period		14 years 2 months 12 days
Total identifiable intangible assets of Altek	11.6	$ 11.6	11.5
Measurement Period Adjustments	0.1
Technology related
Business Acquisition [Line Items]
Amortization Period		10 years 3 months 18 days
Total identifiable intangible assets of Altek	36.6	$ 36.6	36.5
Measurement Period Adjustments	0.1
Trade names
Business Acquisition [Line Items]
Amortization Period		15 years
Total identifiable intangible assets of Altek	4.5	$ 4.5	$ 4.5
Measurement Period Adjustments	$ 0.0