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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2022
Fair Value Disclosures [Abstract] |
Assets and (Liabilities) Measured at Fair Value | The fair value (in millions) of our financial assets and (liabilities) was determined using the following inputs:
Fair Value at September 30, 2022 |  | Level 1 |  | Level 2 |  | Level 3
Measured on a recurring basis: |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 151.5 |  |  | $ | — |
Money market mutual funds |  | $ | 142.0 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 25.7 |  |  | $ | — |
Securities guaranteed by U.S. government |  | $ | — |  |  | $ | 5.0 |  |  | $ | — |
Other governmental securities |  | $ | — |  |  | $ | 1.7 |  |  | $ | — |
Prepaid expenses and other current assets: |  |  |  |  |  |
Interest rate cap contract |  | $ | — |  |  | $ | 0.8 |  |  | $ | — |
Interest rate swap contracts |  | $ | — |  |  | $ | 19.2 |  |  | $ | — |
Deferred costs and other assets, net of current portion |  |  |  |  |  |
Interest rate cap contract |  | $ | — |  |  | $ | 0.6 |  |  | $ | — |
Interest rate swap contracts |  | $ | — |  |  | $ | 37.2 |  |  | $ | — |
Fair Value at December 31, 2021 |  | Level 1 |  | Level 2 |  | Level 3
Measured on a recurring basis: |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 15.7 |  |  | $ | — |
Money market mutual funds |  | $ | 16.1 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |
Corporate debt securities |  | $ | — |  |  | $ | 18.4 |  |  | $ | — |
Prepaid expenses and other current assets: |  |  |  |  |  |
Forward-starting interest rate swap contracts |  | $ | — |  |  | $ | 0.7 |  |  | $ | — |
Deferred costs and other assets, net of current portion |  |  |  |  |  |
Interest rate cap contract |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Forward-starting interest rate swap contracts |  | $ | — |  |  | $ | 15.2 |  |  | $ | — |
Liabilities: |  |  |  |  |  |
Derivative contracts: |  |  |  |  |  |
Interest rate cap contract |  | $ | — |  |  | $ | (0.4) |  |  | $ | — |
Interest rate swap contracts |  | $ | — |  |  | $ | (2.4) |  |  | $ | — |
Measured on a non-recurring basis: |  |  |  |  |  |
Impaired lease-related assets |  | $ | — |  |  | $ | — |  |  | $ | 14.2 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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