Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Deferred commission	$ 20.7	$ 23.7	$ 23.7
Amortization of deferred sales commissions		6.4	11.3
Remaining performance obligation		$ 2,852.7	$ 2,852.7
Remaining performance obligation expected to be recognized over next twelve months, percent		62.00%	62.00%
Software-As-A-Service
Disaggregation of Revenue [Line Items]
Required payment, number of days			30 days
Software Licenses | Minimum
Disaggregation of Revenue [Line Items]
Required payment, number of days			30 days
Software Licenses | Maximum
Disaggregation of Revenue [Line Items]
Required payment, number of days			60 days
PCS | Minimum
Disaggregation of Revenue [Line Items]
Required payment, number of days			30 days
PCS | Maximum
Disaggregation of Revenue [Line Items]
Required payment, number of days			60 days
Engineered Products | Minimum
Disaggregation of Revenue [Line Items]
Required payment, number of days			30 days
Engineered Products | Maximum
Disaggregation of Revenue [Line Items]
Required payment, number of days			60 days
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Cumulative effect on retained earnings	$ 14.3