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Fair Value Measurements (Debt Instruments) (Details) - USD ($)
$ in Millions

Dec. 31, 2021

Dec. 31, 2020

Long-term debt

$ 2,695.7

$ 3,443.8

$750.0 million Fixed Rate Notes Due September 2022 Interest Equal To 3.00% [Member]

Long-term debt

^[1]

0.0

748.6

€15.0 million fixed rate notes due May 2023 [Member]

Long-term debt

16.8

18.1

$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member]

Long-term debt

^[2]

747.7

747.0

$500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain]

Long-term debt

497.2

496.8

$750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member]

Long-term debt

^[3]

743.4

743.1

$700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain]

Long-term debt

690.6

$ 690.2

Fair Value, Inputs, level 2 [Member] | $750.0 million Fixed Rate Notes Due September 2022 Interest Equal To 3.00% [Member]

Debt Instrument, Fair Value Disclosure

763.4

Fair Value, Inputs, level 2 [Member] | €15.0 million fixed rate notes due May 2023 [Member]

Debt Instrument, Fair Value Disclosure

18.1

Fair Value, Inputs, level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member]

Debt Instrument, Fair Value Disclosure

789.1

Fair Value, Inputs, level 2 [Member] | $500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain]

Debt Instrument, Fair Value Disclosure

556.8

Fair Value, Inputs, level 2 [Member] | $750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member]

Debt Instrument, Fair Value Disclosure

1,035.2

Fair Value, Inputs, level 2 [Member] | $700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain]

Debt Instrument, Fair Value Disclosure

$ 903.9

[1]	The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.32%.
[2]	The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.11%.
[3]	The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 4.73%

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

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X

- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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