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Debt and Credit Arrangements Debt Transactions (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument [Line Items] |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ 0 | $ 0 | $ (74,000,000.0) | $ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 300,000 | $ (600,000) | (4,900,000) | $ (1,200,000)
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $3.4 and $5.4, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 650,000,000.0 |  | $ 650,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |  | 4.75% |
4.000% Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 250,000,000.0 |  | $ 250,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  | 4.00% |
Gain (Loss) on Extinguishment of Debt |  |  | $ 9,200,000 |
Redemption Premium |  |  | 8,600,000 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 600,000 |  | 600,000 |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  | 258,900,000 |
4.200% Notes Due 2024 (less unamortized discount and issuance costs of $0.1 and $0.6, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | 500,000,000.0 |  | 500,000,000.0 |
Unsecured Debt 3.75% Note Due in 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500,000,000.0 |  | $ 500,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  | 3.75% |
Unsecured Debt 2.400% Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.40% |  | 2.40% |
Unsecured Debt | $ 494,500,000 |  | $ 494,500,000 |
Debt Instrument, Unamortized Discount | 800,000 |  | 800,000 |
Debt Issuance Costs, Gross | 4,700,000 |  | 4,700,000 |
Unsecured Debt 4.65% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500,000,000.0 |  | $ 500,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.65% |  | 4.65% |
Unsecured Debt 5.40% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500,000,000.0 |  | $ 500,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 5.40% |  | 5.40% |
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.8 and $4.5, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500,000,000.0 |  | $ 500,000,000.0 |
3.750% Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500,000,000.0 |  | $ 500,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  | 3.75% |
Gain (Loss) on Extinguishment of Debt |  |  | $ 36,500,000 |
Redemption Premium |  |  | 30,700,000 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 1,100,000 |  | 1,100,000 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  |  | 4,700,000 |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  | 532,900,000 |
Unsecured Debt 3.375% Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500,000,000.0 |  | $ 500,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 3.375% |  | 3.375% |
Unsecured Debt | $ 493,100,000 |  | $ 493,100,000 |
Debt Instrument, Unamortized Discount | 1,100,000 |  | 1,100,000 |
Debt Issuance Costs, Gross | 5,800,000 |  | 5,800,000 |
Unsecured Debt 4.200% Notes Remaining Principal |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 250,000,000.0 |  | $ 250,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.20% |  | 4.20% |
Gain (Loss) on Extinguishment of Debt |  |  | $ 28,300,000 |
Redemption Premium |  |  | 27,500,000 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 800,000 |  | 800,000 |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  | $ 282,200,000 |

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