Employee Benefits Deferred Compensation Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Liability, Current and Noncurrent	$ 5.6	$ 6.3
Deferred Compensation Arrangement with Individual, Compensation Expense	(0.1)	0.6	$ 0.9
Deferred Compensation Plan Assets	5.6	5.4
Deferred Compensation Plan Assets, Income	$ (0.1)	$ 0.6	$ 1.0