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Debt (Details) $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 04, 2019 USD ($) | Dec. 13, 2018 USD ($) | Oct. 12, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 28, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 03, 2019 USD ($) | Aug. 09, 2018 USD ($) | Jul. 13, 2018 USD ($) | Jun. 28, 2018 USD ($)
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | $ 1,220.8 |  | $ 1,109.3 | $ 1,220.8 |  |  |  |  |
Current Maturities of Long-term Debt |  |  |  |  | (41.3) |  | (41.3) | (41.3) |  |  |  |  |
Long-Term Debt, Net |  |  |  |  | 1,179.5 |  | 1,068.0 | 1,179.5 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 15.4 |  | 8.1 | 15.4 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  | 41.3 |  |  |  |  |  |
2020 |  |  |  |  |  |  | 42.0 |  |  |  |  |  |
2021 |  |  |  |  |  |  | 35.7 |  |  |  |  |  |
2022 |  |  |  |  |  |  | 305.8 |  |  |  |  |  |
2023 |  |  |  |  |  |  | 0.4 |  |  |  |  |  |
Thereafter |  |  |  |  |  |  | 684.1 |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 1,220.8 |  | 1,109.3 | 1,220.8 |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | 400.0 |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 13.1 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 800.0 |  |
Remaining Payment for Debt Extinguishment |  |  |  |  | 115.0 |  |  |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  |  |  |  |  | $ 185.0 |  |  |  |  |  |
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 |  |  |  |  |  |
6.375% Senior Notes due 2049 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 0.0 |  | $ 222.2 | 0.0 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 6.375% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2049 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.0 |  | $ 0.0 | 0.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 0.0 |  | 7.8 | 0.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 0.0 |  | 222.2 | 0.0 |  |  |  |  |
Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] |  |  |  | 147.3 |  | $ 0.0 | 147.3 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 4.625% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2021 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.0 |  | $ 0.0 | 0.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 1.0 |  | 0.0 | 1.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] |  |  |  | 147.3 |  | $ 0.0 | 147.3 |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Triggering Event |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Term Loan Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [2] |  |  |  | 149.5 |  | $ 0.0 | 149.5 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 3.85% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2021 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.0 |  | $ 0.0 | 0.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 0.5 |  | 0.0 | 0.5 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [2] |  |  |  | 149.5 |  | 0.0 | 149.5 |  |  |  |  |
Debentures Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] |  |  |  | 102.6 |  | $ 105.2 | 102.6 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 7.375% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2023 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.2 |  | $ 0.1 | 0.2 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 0.2 |  | 0.2 | 0.2 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [1] |  |  |  | 102.6 |  | 105.2 | 102.6 |  |  |  |  |
Loan With Fond Du Lac County Economic Development Corporation Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 15.3 |  | $ 11.1 | 15.3 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2021 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 3.0 |  | $ 2.3 | 3.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 0.1 |  | 0.0 | 0.1 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 15.3 |  | 11.1 | 15.3 |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Loan Forgiveness |  |  |  |  |  |  | $ 2.1 | $ 2.1 | $ 2.1 |  |  |  |
Annual Forgiveness Percent |  |  |  |  |  |  | 43.00% | 43.00% | 43.00% |  |  |  |
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 Due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 162.5 |  | $ 162.5 | $ 162.5 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 7.125% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2027 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.4 |  | $ 0.3 | 0.4 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 0.4 |  | 0.4 | 0.4 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 162.5 |  | 162.5 | 162.5 |  |  |  |  |
Notes Payable Through 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 6.9 |  | $ 5.9 | 6.9 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.892% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2028 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.2 |  | $ 0.2 | 0.2 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 0.0 |  | 0.0 | 0.0 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 6.9 |  | 5.9 | 6.9 |  |  |  |  |
Senior Notes Due 2048 [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 176.5 |  | $ 176.8 | 176.5 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 6.50% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2048 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.0 |  | $ 0.0 | 0.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 8.5 |  | 8.2 | 8.5 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 176.5 |  | $ 176.8 | 176.5 |  |  |  |  |
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 | [3],[4] |  |  |  | $ 339.7 |  | $ 305.0 | $ 339.7 |  |  |  |  |
Interest Rate |  |  |  |  | 4.10% |  | 3.50% | 4.10% |  |  |  |  |
Due date |  |  |  |  |  |  | 2023 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | $ 0.0 |  | $ 0.0 | $ 0.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 1.6 |  | 1.3 | 1.6 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities | [3],[4] |  |  |  | 339.7 |  | 305.0 | 339.7 |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 800.0 |  |
6.625% Senior Notes due 2049 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | 120.5 |  | $ 120.6 | 120.5 |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 6.625% |  |  |  |  |  |
Due date |  |  |  |  |  |  | 2049 |  |  |  |  |  |
Discount on Long-term Debt |  |  |  |  | 0.0 |  | $ 0.0 | 0.0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  | 4.5 |  | 4.4 | 4.5 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt Including Current Maturities |  |  |  |  | $ 120.5 |  | 120.6 | $ 120.5 |  |  |  |  |
Bridge Loan [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100.0
Bridge Facility, Line of Credit Amount Terminated |  |  |  |  |  |  |  |  |  |  |  | $ 300.0 |
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases |  |  |  |  |  |  |  |  |  |  |  | $ 800.0 |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  | 387.9 |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 12.1 |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Other, Net |  |  |  |  |  |  | $ 100.0 |  |  |  |  |  |
Proceeds from Lines of Credit |  |  |  |  |  | $ 655.0 |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  | 0.15% |  |  |  |  |  |
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 |  |  |  |  |  |  | 1.10% |  |  |  |  |  |
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 |  |  |  |  |  |  | 0.10% |  |  |  |  |  |
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% |  |  |  |  |  |
Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.625% |  |  | 4.625% |  |  |  |  |
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 | $ 125.0 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 222.0 | $ 120.5 |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2048 [Member] [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 185.0 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 176.5 |  |  |  |  |  |  |  |  |
Term Loan Due 2023 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 350.0 |  |
364 Day Tranche Loan [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 300.0 |  |
Term Loan Due 2021 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 150.0 |  |
[1] | Included in Senior notes, 4.625 percent due 2021 at December 31, 2018, is the aggregate fair value related to the fixed-to-floating interest rate swap as discussed in Note 14 – Financial Instruments.
[2] | .
[3] | As of December 31, 2019 and December 31, 2018, the interest rate was 3.50% and 4.10%, respectively.
[4] | Beginning in December 2018, scheduled repayment of the 5-year term loan occurs each March, June, September and December equal to 2.50% of the aggregate principal amount of $350.0 million. The remaining principal amount is due August 2023.

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