Fair Value Measurements Unobservable Inputs Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Adjustment to contingent consideration fair value	$ 0.0	$ 0.2	$ 3.2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	5.8	4.6
Included in other comprehensive income	(1.0)	1.2
Ending balance	4.8	5.8	4.6
Fair Value, Measurements, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent Consideration, Liability	$ 0.0	$ 0.0	$ 0.2