Acquisitions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended					6 Months Ended
	Jan. 31, 2014 Framehawk, Inc. [Member]	Jan. 31, 2013 Zenprise, Inc. [Member]	Jun. 30, 2014 Other 2014 Acquisition [Member]	Dec. 31, 2013 Other 2013 Acquisitions [Member]	Sep. 30, 2013 Other 2013 Acquisitions [Member]	Sep. 30, 2013 Other 2013 Acquisitions [Member] Maximum [Member]	Jan. 31, 2014 General and Administrative Expense [Member] Framehawk, Inc. [Member]	Jun. 30, 2013 General and Administrative Expense [Member] Zenprise, Inc. [Member]	Jun. 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]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Consideration Transferred	$ 24.2	$ 324.0	$ 17.2	$ 5.5	$ 5.3
Cash acquired in business combination	0.2	2.9	0.8		2.8
Contingent consideration amount						3.0
Transaction costs							0.1		0.2	0.6	0.2	0.2
Transaction costs expensed during period								$ 0.1
Stock options converted and assumed		285,817