Mergers and Acquisitions - Finite Lived Intangible Assets Acquired (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 02, 2017	Dec. 31, 2017
Trade name
Business Acquisition [Line Items]
Useful Lives		10 years
Technology
Business Acquisition [Line Items]
Useful Lives		10 years
OnX Holdings LLC [Member]
Business Acquisition [Line Items]
Fair Value	$ 134.0
OnX Holdings LLC [Member] | Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 108.0
Useful Lives	15 years
OnX Holdings LLC [Member] | Trade name
Business Acquisition [Line Items]
Fair Value	$ 16.0
Useful Lives	10 years
OnX Holdings LLC [Member] | Technology
Business Acquisition [Line Items]
Fair Value	$ 10.0
Useful Lives	10 years