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Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 437.4 | $ 439.4 |
Current Maturities of Long-term Debt |  | (5.6) | (5.6) |
Long-Term Debt, Net |  | 431.8 | 433.8 |
Maturities of Long-term Debt [Abstract] |  |  |  |
2018 |  | 5.6 |  |
2019 |  | 5.9 |  |
2020 |  | 5.8 |  |
2021 |  | 153.3 |  |
2022 |  | 0.3 |  |
Thereafter |  | 266.5 |  |
Total Long-Term Debt Including Current Maturities |  | 437.4 | 439.4 |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 300.0 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 295.7 |  |
Letters of Credit Outstanding, Amount |  | $ 5.3 |  |
Minimum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Debt Instrument, Covenant, Interest Coverage Ratio |  | 3.00 |  |
Maximum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Debt Instrument, Covenant, Leverage Ratio |  | 3.50 |  |
Letter of Credit [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 4.3 |  |
Line of Credit [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Increase (Decrease), Other, Net |  | $ 100.0 |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.20% |  |
Line of Credit [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.125% |  |
Line of Credit [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.35% |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Interest Rate During Period |  | 1.30% |  |
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] | 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] | Base Rate [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Interest Rate During Period |  | 0.30% |  |
Line of Credit [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Interest Rate During Period |  | 0.00% |  |
Line of Credit [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Line of Credit Facility, Interest Rate During Period |  | 0.90% |  |
Notes Due 2027 [Member] |  |  |  |
Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 162.4 | 162.3 |
Interest Rate |  | 7.125% |  |
Due date |  | 2027 |  |
Discount on Long-term Debt |  | $ 0.4 | 0.4 |
Debt Issuance Costs, Net |  | 0.4 | 0.5 |
Maturities of Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | 162.4 | 162.3 |
Senior Notes Due 2021 [Member] |  |  |  |
Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] | $ 148.2 | 147.8 |
Interest Rate |  | 4.625% |  |
Due date |  | 2021 |  |
Debt Issuance Costs, Net |  | $ 1.5 | 1.9 |
Maturities of Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] | 148.2 | 147.8 |
Debentures Due 2023 [Member] |  |  |  |
Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] | $ 103.4 | 103.4 |
Interest Rate |  | 7.375% |  |
Due date |  | 2023 |  |
Discount on Long-term Debt |  | $ 0.2 | 0.2 |
Debt Issuance Costs, Net |  | 0.2 | 0.2 |
Maturities of Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] | 103.4 | 103.4 |
Loan With Fond Du Lac County Economic Development Corporation Due 2021 [Member] |  |  |  |
Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 19.6 | 23.8 |
Interest Rate |  | 2.00% |  |
Due date |  | 2021 |  |
Discount on Long-term Debt |  | $ 3.0 | 3.8 |
Debt Issuance Costs, Net |  | 0.1 | 0.1 |
Maturities of Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | 19.6 | 23.8 |
Line of Credit Facility [Abstract] |  |  |  |
Total Loan Forgiveness |  | $ 2.1 | $ 2.1 | $ 2.0
Annual Forgiveness Percent |  | 43.00% | 43.00% | 41.00%
Loan With Fond Du Lac County Economic Development Corporation Due 2021 [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |
Annual Forgiveness Percent |  | 43.00% |  |
Notes Payable Through 2027 [Member] |  |  |  |
Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 3.8 | $ 2.1 |
Interest Rate |  | 5.892% |  |
Due date |  | 2027 |  |
Discount on Long-term Debt |  | $ 0.2 | 0.2 |
Maturities of Long-term Debt [Abstract] |  |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 3.8 | $ 2.1 |
[1] | Included in Senior notes, 4.625 percent due 2021 and Debentures, 7.375 percent due 2023 at December 31, 2017 and December 31, 2016, are the aggregate fair values related to the fixed-to-floating interest rate swaps as discussed in Note 14 – Financial Instruments.

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