Equity and Cash Incentive Program - Fair Value and Average Attainment Used in Determining Compensation Cost of the Performance Shares (Details) - Performance shares - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at date of grant (in dollars per share)	$ 56.32
Dover
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value at date of grant (in dollars per share)		$ 79.28	$ 57.25
Average attainment rate reflected in expense		0.00%	0.00%