Segment Information (Textuals) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Inventory Write-down	$ 0.0	$ 23.8	$ 74.5
Number of customers that account for greater than 10% of revenue	0	0	0
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net, non-routine income (expense)	$ 142.1	$ 149.5	$ 228.4
Segment Reconciling Items [Member] | Purchase Accounting Pre Tax Charges For Amortization Of Acquired Intangibles
Segment Reporting Information [Line Items]
Net, non-routine income (expense)	82.9	93.3	113.4
Segment Reconciling Items [Member] | Legal Consulting And Deal Expense Including Gains And Loss On Divestitures
Segment Reporting Information [Line Items]
Net, non-routine income (expense)	19.7	26.8
Segment Reconciling Items [Member] | Charges From A Loss Making Contract Related To A Discontinued Offering
Segment Reporting Information [Line Items]
Net, non-routine income (expense)	25.5
Segment Reconciling Items [Member] | Other Matters
Segment Reporting Information [Line Items]
Net, non-routine income (expense)	$ 14.0	16.6
Segment Reconciling Items [Member] | Inventory Charges
Segment Reporting Information [Line Items]
Net, non-routine income (expense)		$ 12.8	74.5
Segment Reconciling Items [Member] | Acquisition Integration Expenses
Segment Reporting Information [Line Items]
Net, non-routine income (expense)			$ 47.2