Business Combinations, Purchase Price Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 3,081.7	$ 2,981.3	$ 2,981.5
AppFormix [Member]
Business Acquisition [Line Items]
Net tangible assets acquired/(liabilities) assumed	(5.3)
Intangible assets acquired	20.3
Goodwill	32.9
Total	47.9
Aurrion, Inc [Member]
Business Acquisition [Line Items]
Net tangible assets acquired/(liabilities) assumed	6.0
Intangible assets acquired	49.0
Goodwill	46.9
Total	101.9
BTI Systems, Inc [Member]
Business Acquisition [Line Items]
Net tangible assets acquired/(liabilities) assumed	(19.7)
Intangible assets acquired	43.3
Goodwill	20.2
Total	43.8
Business Acquisitions 2016 [Member]
Business Acquisition [Line Items]
Net tangible assets acquired/(liabilities) assumed	(19.0)
Intangible assets acquired	112.6
Goodwill	100.0
Total	$ 193.6
WANDL, Inc, [Member]
Business Acquisition [Line Items]
Net tangible assets acquired/(liabilities) assumed			(2.7)
Intangible assets acquired			17.8
Goodwill			13.6
Total			$ 28.7