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Derivative Instruments and Hedging Activities (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Derivative asset, fair value	$ 38.6		$ 38.6		$ 39.3
Derivative liability, fair value	11.9		11.9		15.0
Foreign currency contracts \| Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset, fair value	3.5		3.5		0.6
Foreign currency contracts \| Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability, fair value	0.5		0.5		1.9
Foreign currency contracts \| Not Designated as Hedging Instrument \| Other current assets
Derivative [Line Items]
Derivative asset, fair value	19.9		19.9		11.7
Foreign currency contracts \| Not Designated as Hedging Instrument \| Other current liabilities
Derivative [Line Items]
Derivative liability, fair value	11.4		11.4		13.1
Cross currency swap contract \| Designated as Hedging Instrument \| Other noncurrent assets
Derivative [Line Items]
Derivative asset, fair value	15.2		15.2		27.0
Cross currency swap contract \| Designated as Hedging Instrument \| Other noncurrent liabilities
Derivative [Line Items]
Derivative liability, fair value	0.0		0.0		$ 0.0
Other expense, net \| Foreign currency contracts \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ (7.0)	$ 25.6	$ 16.1	$ 31.3