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Financial Instruments - Schedule Of Available-For-Sale Investments With Unrealized Losses (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months Fair Value	$ 715.6	$ 519.4
Unrealized losses less than 12 months	(0.2)	(0.5)
Unrealized losses 12 months or greater Fair Value	0.0	133.0
Unrealized losses 12 months or greater	0.0	(0.3)
Total Fair Value	715.6	652.4
Total Unrealized Losses	(0.2)	(0.8)
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months Fair Value	352.7	237.0
Unrealized losses less than 12 months	(0.2)	(0.2)
Unrealized losses 12 months or greater Fair Value	0.0	0.0
Unrealized losses 12 months or greater	0.0	0.0
Total Fair Value	352.7	237.0
Total Unrealized Losses	(0.2)	(0.2)
U.S. treasuries
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months Fair Value	278.1	236.5
Unrealized losses less than 12 months	0.0	(0.2)
Unrealized losses 12 months or greater Fair Value	0.0	87.5
Unrealized losses 12 months or greater	0.0	(0.2)
Total Fair Value	278.1	324.0
Total Unrealized Losses	0.0	(0.4)
U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months Fair Value	63.5	45.9
Unrealized losses less than 12 months	0.0	(0.1)
Unrealized losses 12 months or greater Fair Value	0.0	45.5
Unrealized losses 12 months or greater	0.0	(0.1)
Total Fair Value	63.5	91.4
Total Unrealized Losses	0.0	$ (0.2)
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months Fair Value	21.3
Unrealized losses less than 12 months	0.0
Unrealized losses 12 months or greater Fair Value	0.0
Unrealized losses 12 months or greater	0.0
Total Fair Value	21.3
Total Unrealized Losses	$ 0.0

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

+ Details

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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