Business Combinations, Textuals (Details) $ in Millions		12 Months Ended
	Jan. 07, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) business	Dec. 31, 2013 USD ($) business
Business Acquisition [Line Items]
Length of time subsequent to acquisition date may result in changes of additional information		12 months
Number of businesses acquired | business			1	1
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Consideration transferred			$ 28.7
Net tangible assets acquired			0.0
Intangible assets acquired			$ 17.8
2013 Acquisitions [Member]
Business Acquisition [Line Items]
Consideration transferred				$ 10.0
Net tangible assets acquired				0.1
Intangible assets acquired				$ 9.9
Acquired intangible asset, weighted average estimated useful life (in years)				5 years
WANDL, Inc, [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 17.8
Acquired intangible asset, weighted average estimated useful life (in years)		7 years
WANDL, Inc, [Member] | 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 28.7
Percentage of interests acquired	100.00%
Share-based awards assumed, fair value	$ 34.9