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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 25, 2021
Schedule of New Debt Issuance [Line Items] |  |  |  |
Loss on Extinguishment of Debt | $ (74.0) | $ 0.0 | $ 0.0 |
Recognition of previously unrealized losses included in net income | (4.2) | $ (2.4) | $ (2.3) |
3.75% Notes Due 2021 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |
4.00% Notes Due 2022 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 250.0 |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | 258.9 |  |  |
Loss on Extinguishment of Debt | 9.2 |  |  |
Redemption Premium | 8.6 |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0.6 |  |  |
3.75% Notes Due 2023 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | 532.9 |  |  |
Loss on Extinguishment of Debt | 36.5 |  |  |
Redemption Premium | 30.7 |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 1.1 |  |  |
Recognition of previously unrealized losses included in net income | 4.7 |  |  |
4.20% Notes Due 2024 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 250.0 |  |  |
Debt instrument, unamortized discount | 0.1 |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | 282.2 |  |  |
Loss on Extinguishment of Debt | 28.3 |  |  |
Redemption Premium | 27.5 |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0.8 |  |  |
4.65% Notes Due 2028 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |
Debt instrument, unamortized discount | 1.2 |  |  |
4.75% Note Due 2030 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 650.0 |  |  |
Debt instrument, unamortized discount | 3.2 |  |  |
5.40% Notes Due 2048 |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |
Debt instrument, unamortized discount | 2.7 |  |  |
2.400% Note Due 2031 (less unamortized discount and issuance costs of $0.7 and $4.3, respectively) |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |
Unsecured Debt |  |  |  | $ 494.5
Debt instrument, unamortized discount | 0.7 |  |  | 0.8
Debt Issuance Costs, Gross |  |  |  | 4.7
3.375% Note Due 2041 (less unamortized discount and issuance costs of $1.1 and $5.5, respectively) |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |
Unsecured Debt |  |  |  | 493.1
Debt instrument, unamortized discount | 1.1 |  |  | 1.1
Debt Issuance Costs, Gross |  |  |  | $ 5.8
Unsecured Debt 4.200% Notes Original Principal |  |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |  |

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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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