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Debt (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 22, 2022 | Mar. 04, 2019 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 02, 2021 | Jul. 16, 2021 | Dec. 31, 2019 | Jul. 03, 2019
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | $ 2,544.7 |  | $ 2,544.7 |  | $ 1,845.2 |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  | (35.7) |  | (35.7) |  | (28.8) |  |  |  |  |
Other Long-term Debt |  |  |  | 13.9 |  | 13.9 |  | 7.4 |  |  |  |  |
Current Maturities of Long-term Debt |  |  |  | (89.0) |  | (89.0) |  | (37.4) |  |  |  |  |
Long-Term Debt, Net |  |  |  | 2,420.0 |  | 2,420.0 |  | 1,779.0 |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Current and Long-term |  |  |  |  |  | 749.0 |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  | 89.0 |  | 89.0 |  |  |  |  |  |  |
2020 |  |  |  | 451.5 |  | 451.5 |  |  |  |  |  |  |
2021 |  |  |  | 1.3 |  | 1.3 |  |  |  |  |  |  |
2022 |  |  |  | 1.1 |  | 1.1 |  |  |  |  |  |  |
2023 |  |  |  | 161.3 |  | 161.3 |  |  |  |  |  |  |
Thereafter |  |  |  | 1,840.5 |  | 1,840.5 |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | 2,544.7 |  | 2,544.7 |  | 1,845.2 |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 3.4 |  | 3.4 |  |  |  |  |  |  |
Proceeds from Issuance of Commercial Paper |  |  |  |  |  | 500.0 |  | 200.0 |  |  |  |  |
Commercial Paper, Maximum Amount Utilized |  |  |  |  |  | 300.0 |  | 100.0 |  |  |  |  |
Proceeds from Notes Payable |  | $ 741.8 |  |  |  | 992.9 |  |  |  |  |  |  |
Less: Restricted Cash |  |  |  | 12.9 |  | 12.9 |  | 12.2 | $ 10.7 |  |  |  |
Proceeds from Issuance of Long-term Debt, Excluding Current Maturities |  |  |  |  |  | 741.8 |  |  |  |  |  |  |
Repayments of Long-term Debt, Current |  |  |  |  |  | (37.3) |  |  |  |  |  |  |
Repayments of Long-term Debt, Current and Long-term |  |  |  |  |  | (59.1) |  |  |  |  |  |  |
Other Debt Activity, Excluding Current Maturities |  |  |  |  |  | 2.6 |  |  |  |  |  |  |
Other Debt Activity, Current |  |  |  |  |  | 0.1 |  |  |  |  |  |  |
Other Debt Activity, Current and Long-term |  |  |  |  |  | 2.7 |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  | 2,509.0 |  | 2,509.0 |  | 1,816.4 |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Current |  |  |  |  |  | 7.2 |  |  |  |  |  |  |
Repayments of Long-term Debt, Excluding Current Maturities |  |  |  |  |  | (21.8) |  |  |  |  |  |  |
Short-Term Debt, Refinanced, Amount |  |  |  |  |  | (81.6) |  |  |  |  |  |  |
Reclassification of total debt |  |  |  |  |  | 0.0 |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  | 8.2 |  | 7.1 |  |  |  |  |
Transaction Financing Charges |  |  |  |  |  | 0.1 |  | 4.2 | 0.0 |  |  |  |
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 |  |  |  | 52.8 |  | 52.8 |  | 97.9 | 93.4 |  |  | $ 93.3 |
Recoveries |  |  |  |  |  | 0.0 |  | 0.0 | 0.0 |  |  |  |
Trustee Bank [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Restricted Cash |  |  |  | 8.0 |  | 8.0 |  | 12.2 |  |  |  |  |
Total Pension Plan Net Assets [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  |  |  | 0.0 |  | 0.0 |  |  |  |  |  |  |
Nonqualified Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  |  |  | 0.0 |  | $ 0.0 |  | 0.0 |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 300.0 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  |  |  |  |  | 3.50 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio |  |  |  |  |  | 3.00 |  |  |  |  |  |  |
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 |  |  |  |  |
Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Triggering Event |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
Debentures Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | 80.1 | [1] | $ 80.1 | [1] | 80.8 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | $ 80.1 | [1] | $ 80.1 | [1] | $ 80.8 |  |  |  |  |
Loan With Fond Du Lac County Economic Development Corporation Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 7.375% |  | 7.375% |  | 7.375% |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loan Forgiveness |  |  |  |  |  |  |  | $ 2.1 | $ 2.1 |  |  |  |
Annual Forgiveness Percent |  |  |  |  |  |  |  | 43.00% | 43.00% |  |  |  |
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 |  |  |  |  |
Senior Notes Due 2048 [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Triggering Event |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
Term Loan Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [2],[3] |  |  | $ 0.0 |  | $ 0.0 |  | 56.3 |  |  |  |  |
Interest Rate |  |  |  | 1.72% |  | 1.72% |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [2],[3] |  |  | $ 0.0 |  | $ 0.0 |  | 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 |  | 0.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | 300.0 |  | 300.0 |  | 0.0 |  |  |  |  |
4.400% Senior Notes due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | 450.0 |  | 450.0 |  | 0.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  | 450.0 |  | 450.0 |  | $ 0.0 |  |  |  |  |
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 |  |  |  | 747.2 |  | 747.2 |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 2.8 |  | 2.8 |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Other, Net |  |  |  |  |  | $ 100.0 |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  | 0.15% |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 125.0 |  | $ 125.0 |  |  |  |  |  |  |
Line of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  | 0.35% |  |  |  |  |  |  |
Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  | 0.125% |  |  |  |  |  |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  | 1.10% |  |  |  |  |  |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  | 1.90% |  |  |  |  |  |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Line of Credit [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  | 0.10% |  |  |  |  |  |  |
Line of Credit [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  | 0.90% |  |  |  |  |  |  |
Line of Credit [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Senior Notes Due 2021 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 150.0
6.375% Senior Notes due 2049 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Triggering Event |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
6.625% Senior Notes due 2049 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Triggering Event |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 and December 31, 2021, are the aggregate fair values related to the fixed-to-floating interest rate swaps as discussed in Note 13 – Financial Instruments. During the third quarter of 2022, the Debentures were reclassified from Long-term debt to Current maturities of long-term debt.
[2] | (B) During 2022, the Company made the remaining principal repayments, totaling $56.3 million.
[3] | As of December 31, 2021, the interest rate was 1.72%.

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