Basis of Presentation Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	$ 66.6	$ 61.3
Deferred Costs	37.0	33.2
Other Current Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	23.7	21.0
Other Noncurrent Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Noncurrent	42.9	40.3
Other Current Assets [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Costs, Current	13.3	11.6
Other Noncurrent Assets [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Costs, Noncurrent	$ 23.7	$ 21.6
Nonsoftware Service, Support and Maintenance Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Product's Estimated Life	4 years