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v3.21.2

Debt - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 08, 2021 | Sep. 21, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amortization of financing costs |  |  | $ 0.5 | $ 0.5 | $ 1.5 | $ 1.5 |
Long term debt |  |  | $ 3,190.4 |  | 3,190.4 |  | $ 2,493.7
Debt instrument interest |  |  |  |  | $ 55.2 | $ 56.9 |
Senior Notes | 3.05% Senior Notes, due October 2051 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 700.0 |  |  |  |  |
Stated interest rate |  | 3.05% | 3.05% |  | 3.05% |  |
Debt instrument, maturity date |  | Oct. 31, 2051 |  |  | Oct. 31, 2051 |  |
Long term debt |  |  | $ 696.3 |  | $ 696.3 |  | $ 0.0
Payments of debt issuance costs |  | $ 7.6 |  |  |  |  |
Senior Notes | 4.50% Senior Notes, due November 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 700.0 |  |  |  |  |
Stated interest rate |  | 4.50% | 4.50% |  | 4.50% |  |
Debt instrument, maturity date |  | Nov. 01, 2023 |  |  |  |  |
Senior Notes | Fixed-Rate Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Book value of fixed rate debt |  |  | $ 3,190.4 |  | $ 3,190.4 |  |
Long-term debt (fixed-rate debt), fair value |  |  | 3,416.0 |  | $ 3,416.0 |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Aug. 29, 2021 |  |
Debt instrument offering date |  |  |  |  | Jun. 08, 2021 |  |
Letter Of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long term debt |  |  | 23.5 |  | $ 23.5 |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 5 years |  |
Long term debt |  |  | $ 350.0 |  | $ 350.0 |  |
Subsequent Events | Senior Notes | 4.50% Senior Notes, due November 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 4.50% |  |  |  |  |  |
Write off amount of remaining balance of unamortized debt issuance costs | $ 1.4 |  |  |  |  |  |
Debt instrument, repurchase amount | 769.8 |  |  |  |  |  |
Redemption premium | 56.1 |  |  |  |  |  |
Accrued and unpaid interest | $ 13.7 |  |  |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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