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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |
Financial instruments measured at fair value on a recurring basis |
|  | December 31, 2023
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets at Fair Value: |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 10.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 10.2 |
Mutual funds |  | 101.3 |  |  | — |  |  | — |  |  | 101.3 |
Equity securities |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Total Marketable Securities |  | 111.7 |  |  | — |  |  | — |  |  | 111.7 |
Total Assets at Fair Value |  | $ | 111.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 111.7 |
|  | December 31, 2022
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets at Fair Value: |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 11.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 11.3 |
Mutual funds |  | 84.5 |  |  | — |  |  | — |  |  | 84.5 |
Equity securities |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Total Marketable Securities |  | 96.0 |  |  | — |  |  | — |  |  | 96.0 |
Total Assets at Fair Value |  | $ | 96.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 96.0 |
Fair value of Debt Instruments [Table Text Block] | At December 31, 2023, the fair values (in U.S. dollar equivalents) were as follows:
(in millions) |  | Fair Value |  | Level
$750.0 million fixed rate notes due March 2025 |  | 733.8 |  |  | Level 2
$500.0 million fixed rate notes due June 2028 |  | 489.3 |  |  | Level 2
$750.0 million fixed rate notes due March 2032 |  | 669.0 |  |  | Level 2
$750.0 million fixed rate notes due September 2043 |  | 802.2 |  |  | Level 2
$700.0 million fixed rate notes due June 2048 |  | 641.0 |  |  | Level 2

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//820/tableOfContent + Details
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