Stock-Based Compensation (Deferred Compensation Program) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation	$ 17.9	$ 14.7
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation	0.1
Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation	8.3
Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation	$ 1.3