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Debt (Schedule Of Short-Term And Long-Term Debt) (Details) € in Millions, $ in Millions	1 Months Ended			3 Months Ended
	Mar. 31, 2015	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2022 EUR (€)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Long-term debt					$ 3,437.1	$ 2,695.7
Forward starting interest rate swap agreement fixed rate	3.11%	4.73%	3.32%
Short-term Debt					0.0	749.4
$750.0 million Fixed Rate Notes Due September 2022, stated rate of 3.00% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 750.0
Debt Instrument, Maturity Date				Sep. 15, 2022
Debt Instrument, Interest Rate, Stated Percentage				3.00%	3.00%
Short-term Debt					$ 0.0	749.4
€15.0 million fixed rate notes due May 2023 [Member]
Debt Instrument [Line Items]
Long-term debt					$ 16.6	16.8
Debt Instrument, Face Amount | €				€ 15.0
Debt Instrument, Maturity Date				May 01, 2023
Debt Instrument, Interest Rate, Stated Percentage				4.30%	4.30%
$750.0 Million Fixed Rate Notes Due March 2025, stated rate of 3.00% [Member]
Debt Instrument [Line Items]
Long-term debt					$ 747.9	747.7
Debt Instrument, Face Amount					$ 750.0
Debt Instrument, Maturity Date				Mar. 15, 2025
Debt Instrument, Interest Rate, Stated Percentage				3.00%	3.00%
$500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain]
Debt Instrument [Line Items]
Long-term debt					$ 497.3	497.2
Debt Instrument, Face Amount					$ 500.0
Debt Instrument, Maturity Date				Jun. 15, 2028
Debt Instrument, Interest Rate, Stated Percentage				3.75%	3.75%
$750.0 million Fixed Rate Notes Due September 2043, stated rate of 5.30% [Member]
Debt Instrument [Line Items]
Long-term debt					$ 743.4	743.4
Debt Instrument, Face Amount					$ 750.0
Debt Instrument, Maturity Date				Sep. 15, 2043
Debt Instrument, Interest Rate, Stated Percentage				5.30%	5.30%
$700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain]
Debt Instrument [Line Items]
Long-term debt					$ 690.7	690.6
Debt Instrument, Face Amount					$ 700.0
Debt Instrument, Maturity Date				Jun. 15, 2048
Debt Instrument, Interest Rate, Stated Percentage				4.15%	4.15%
$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65%
Debt Instrument [Line Items]
Long-term debt					$ 741.2	$ 0.0
Debt Instrument, Face Amount					$ 750.0
Debt Instrument, Maturity Date				Mar. 15, 2032
Debt Instrument, Interest Rate, Stated Percentage				2.65%	2.65%

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