Acquisitions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended				9 Months Ended					1 Months Ended
	Jan. 31, 2014 Framehawk, Inc. [Member]	Jan. 31, 2013 Zenprise, Inc. [Member]	Jun. 30, 2014 Other 2014 Acquisition [Member]	Sep. 30, 2014 Other 2013 Acquisitions [Member]	Dec. 31, 2013 Other 2013 Acquisitions [Member]	Sep. 30, 2013 Other 2013 Acquisitions [Member]	Sep. 30, 2014 Other 2013 Acquisitions [Member] Maximum [Member]	Sep. 30, 2013 Other 2013 Acquisitions [Member] Maximum [Member]	Sep. 30, 2013 General and Administrative Expense [Member] Zenprise, Inc. [Member]	Sep. 30, 2014 General and Administrative Expense [Member] Other 2014 Acquisition [Member]	Jan. 31, 2013 General and Administrative Expense [Member] Other 2014 Acquisition [Member]	Dec. 31, 2013 General and Administrative Expense [Member] Other 2013 Acquisitions [Member]	Sep. 30, 2013 General and Administrative Expense [Member] Other 2013 Acquisitions [Member]	Oct. 31, 2014 Subsequent Event [Member] RightSignature, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration	$ 24.2	$ 324.0	$ 17.2		$ 5.5	$ 5.3								$ 37.5
Cash acquired in business combination	0.2	2.9	0.8			2.8								1.5
Contingent consideration amount							1.0	3.0
Contingent consideration paid				2.0
Transaction costs										0.2	0.6	0.2	0.2
Transaction costs expensed during period									$ 0.1
Stock options converted and assumed		285,817