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Debt (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 22, 2022 | Mar. 04, 2019 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 01, 2022 | Jul. 16, 2021 | Dec. 31, 2020 | Jul. 03, 2019
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | $ 2,462.9 |  | $ 2,462.9 |  | $ 2,544.7 |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  | (32.5) |  | (32.5) |  | (35.7) |  |  |  |  |
Other Long-term Debt |  |  | 12.2 |  | 12.2 |  | 13.9 |  |  |  |  |
Current Maturities of Long-term Debt |  |  | (454.7) |  | (454.7) |  | (89.0) |  |  |  |  |
Long-Term Debt, Net |  |  | 1,975.7 |  | 1,975.7 |  | 2,420.0 |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Current and Long-term |  |  |  |  | 4.7 |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  | 455.4 |  | 455.4 |  |  |  |  |  |  |
2020 |  |  | 2.2 |  | 2.2 |  |  |  |  |  |  |
2021 |  |  | 2.2 |  | 2.2 |  |  |  |  |  |  |
2022 |  |  | 162.2 |  | 162.2 |  |  |  |  |  |  |
2023 |  |  | 0.9 |  | 0.9 |  |  |  |  |  |  |
Thereafter |  |  | 1,840.0 |  | 1,840.0 |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 2,462.9 |  | 2,462.9 |  | 2,544.7 |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | 8.5 |  | 8.5 |  |  |  |  |  |  |
Proceeds from Issuance of Commercial Paper |  |  |  |  | 485.0 |  | 500.0 |  |  |  |  |
Commercial Paper, Maximum Amount Utilized |  |  |  |  | 125.0 |  | 300.0 |  |  |  |  |
Proceeds from Notes Payable | $ 741.8 |  |  |  | 992.9 |  |  |  |  |  |  |
Less: Restricted Cash |  |  | 11.1 |  | 11.1 |  | 12.9 | $ 12.2 |  |  |  |
Proceeds from Issuance of Long-term Debt, Excluding Current Maturities |  |  |  |  | 0.0 |  |  |  |  |  |  |
Repayments of Long-term Debt, Current |  |  |  |  | (90.5) |  |  |  |  |  |  |
Repayments of Long-term Debt, Current and Long-term |  |  |  |  | (90.9) |  |  |  |  |  |  |
Other Debt Activity, Excluding Current Maturities |  |  |  |  | 6.8 |  |  |  |  |  |  |
Other Debt Activity, Current |  |  |  |  | 0.8 |  |  |  |  |  |  |
Other Debt Activity, Current and Long-term |  |  |  |  | 7.6 |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  | 2,430.4 |  | 2,430.4 |  | 2,509.0 |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Current |  |  |  |  | 4.7 |  |  |  |  |  |  |
Repayments of Long-term Debt, Excluding Current Maturities |  |  |  |  | (0.4) |  |  |  |  |  |  |
Short-Term Debt, Refinanced, Amount |  |  |  |  | (450.7) |  |  |  |  |  |  |
Reclassification of total debt |  |  |  |  | 0.0 |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  | 8.2 | 7.1 |  |  |  |
Transaction Financing Charges |  |  |  |  | 0.0 |  | 0.1 | 4.2 |  |  |  |
Line of Credit Facility, Maximum Amount Outstanding During Period |  |  | 127.8 |  |  |  |  |  |  |  |  |
Commercial Paper, Maximum Amount Allowed to be Utilized |  |  |  |  | 500.0 |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  |  | 71.3 |  | 71.3 |  | 52.8 | 97.9 |  |  | $ 93.4 |
Recoveries |  |  |  |  | 0.0 |  | 0.0 | $ 0.0 |  |  |  |
Trustee Bank [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Less: Restricted Cash |  |  | 8.3 |  | 8.3 |  | 8.0 |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 300.0 |  |  |
6.375% Senior Notes due 2049 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 230.0 |  | 230.0 |  | 230.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 230.0 |  | 230.0 |  | 230.0 |  |  |  |  |
Debentures Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 0.0 | [1] | 0.0 | [1] | 80.1 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | $ 0.0 | [1] | $ 0.0 | [1] | $ 80.1 |  |  |  |  |
Loan With Fond Du Lac County Economic Development Corporation Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 7.375% |  | 7.375% |  | 7.375% |  |  |  |  |
Notes Due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | $ 160.7 |  | $ 160.7 |  | $ 160.7 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 160.7 |  | 160.7 |  | 160.7 |  |  |  |  |
Term Loan Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  |  |  | 56.3 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  |  |  | 56.3 |  |  |  |  |
6.625% Senior Notes due 2049 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 125.0 |  | 125.0 |  | 125.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 125.0 |  | 125.0 |  | 125.0 |  |  |  |  |
6.500% Senior Notes due 2048 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 185.0 |  | 185.0 |  | 185.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 185.0 |  | 185.0 |  | 185.0 |  |  |  |  |
Senior Notes, 2.4% due 2031 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 550.0 |  | 550.0 |  | 550.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 550.0 |  | 550.0 |  | 550.0 |  |  |  |  |
0.85% Senior Note Due 2024 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 450.0 |  | 450.0 |  | 450.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 450.0 |  | 450.0 |  | 450.0 |  |  |  |  |
5.100% Senior Notes due 2052 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 300.0 |  | 300.0 |  | 300.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 300.0 |  | 300.0 |  | 300.0 |  |  |  |  |
4.400% Senior Notes due 2032 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 450.0 |  | 450.0 |  | 450.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  | 450.0 |  | 450.0 |  | 450.0 |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 750.0 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 741.9 |  | 741.9 |  | 747.2 |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  | 8.1 |  | 8.1 |  | 2.8 |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Other, Net |  |  |  |  | 100.0 |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  | $ 125.0 |  |  |  |  |
Senior Notes Due 2021 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  | $ 150.0
Senior Notes Due 2049 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 230.0 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 222.0 |  |  |  |  |  |  |  |  |  |
Term Loan Due 2023 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Other Debt |  |  |  |  | 95.0 |  |  |  |  |  |  |
0.850% Senior Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  | 450.0 |  | 450.0 |  |  |  |  |  |  |
2,400% Senior Notes due 2031 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  | 550.0 |  | 550.0 |  |  |  |  |  |  |
Debentures Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 103.1 |  | 103.1 |  |  |  |  |  |  |
Repayments of Other Debt |  |  |  |  | 79.7 |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | 23.4 |  | 23.4 |  |  |  |  |  |  |
Notes Due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | $ 2.5 |  | $ 2.5 |  |  |  |  |  |  |
4.400% Senior Notes due 2032 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 450.0 |  |  |  |  |  |  |  |  |  |  |
5.100% Senior Notes due 2052 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | $ 300.0 |  |  |  |  |  |  |  |  |  |  |
[1] | (A) Included in Debentures, 7.375% due 2023 as of December 31, 2022, are the aggregate fair values related to the fixed-to-floating interest rate swaps as discussed in Note 12 – Financial Instruments. During the third quarter of 2022, the Debentures were reclassified from Long-term debt to Current maturities of long-term debt, of which the remaining principal payments were paid during the third quarter of 2023.

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