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Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 442.4 | $ 448.5
Current Maturities of Long-term Debt |  | (5.9) | (6.0)
Long-Term Debt, Net |  | 436.5 | 442.5
Long-term Debt Repurchased |  | 0.0 | 0.0
Maturities of Long-term Debt [Abstract] |  |  |
2017 |  | 5.9 |
2018 |  | 5.7 |
2019 |  | 5.7 |
2020 |  | 5.8 |
2021 |  | 152.4 |
Thereafter |  | 266.9 |
Total Long-Term Debt Including Current Maturities |  | 442.4 | 448.5
Line of Credit Facility [Abstract] |  |  |
Letters of Credit Outstanding, Amount |  | $ 6.5 |
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 |
Line of Credit [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 300.0 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 295.7 |
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% |
Letter of Credit [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Letters of Credit Outstanding, Amount |  | $ 4.3 |
Notes Due 2027 [Member] |  |  |
Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 162.3 | 162.2
Interest Rate |  | 7.125% |
Due date |  | 2027 |
Discount on Long-term Debt |  | $ 0.4 | 0.4
Debt Issuance Costs, Net |  | 0.5 | 0.6
Maturities of Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 162.3 | 162.2
Senior Notes Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Redemption Price, Percentage, Triggering Event |  | 101.00% |
Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities | [1] | $ 147.8 | $ 149.6
Interest Rate |  | 4.625% | 4.625%
Due date |  | 2021 |
Debt Issuance Costs, Net |  | $ 1.9 | $ 2.3
Maturities of Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities | [1] | 147.8 | 149.6
Debentures Due 2023 [Member] |  |  |
Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities | [1] | $ 103.4 | $ 104.7
Interest Rate |  | 7.375% | 7.375%
Due date |  | 2023 |
Discount on Long-term Debt |  | $ 0.2 | $ 0.2
Debt Issuance Costs, Net |  | 0.2 | 0.3
Maturities of Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities | [1] | 103.4 | 104.7
Loan With Fond Du Lac County Economic Development Corporation Due 2021 [Member] |  |  |
Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 23.8 | 28.1
Interest Rate |  | 2.00% |
Due date |  | 2021 |
Discount on Long-term Debt |  | $ 3.8 | 4.5
Debt Issuance Costs, Net |  | 0.1 | 0.1
Maturities of Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities |  | 23.8 | 28.1
Line of Credit Facility [Abstract] |  |  |
Total Loan Forgiveness |  | $ 2.1 | $ 2.0
Annual Forgiveness Percent |  | 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 |  | $ 5.1 | $ 3.9
Interest Rate |  | 5.892% |
Due date |  | 2027 |
Maturities of Long-term Debt [Abstract] |  |  |
Total Long-Term Debt Including Current Maturities |  | $ 5.1 | $ 3.9
[1] | Included in Senior notes, 4.625% due 2021 and Debentures, 7.375% due 2023 at December 31, 2016 and December 31, 2015, 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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