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Financing Arrangements - Long-term Debt (Details 2) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Nov. 13, 2017 | Nov. 18, 2016
Term Loan Facility |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities |  |  |  | $ 720.0
Long-term debt, prepayment | $ 684.0 |  |  |
Senior Notes | Senior Notes Due 2022 [Member] |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities |  |  | $ 550.0 |
Stated interest rate |  |  | 3.25% |
Senior Notes | Senior Notes Due 2027 [Member] |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities |  |  | $ 700.0 |
Stated interest rate |  |  | 4.05% |
Senior Notes | Senior Notes Due 2023 |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities | $ 900.0 |  |  |
Stated interest rate | 4.25% |  |  |
Senior Notes | Senior Notes Due 2033 |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities | $ 500.0 |  |  |
Stated interest rate | 5.45% |  |  |
Senior Notes | Senior Notes Due 2043 |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities | $ 600.0 |  |  |
Stated interest rate | 5.625% |  |  |
Senior Notes | Senior Notes Due 2021 |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities | $ 450.0 |  |  |
Stated interest rate | 3.75% |  |  |
Senior Notes | Senior Notes Due 2041 |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities | $ 300.0 |  |  |
Stated interest rate | 4.875% |  |  |
Bank Loan |  |  |  |
Debt Instrument |  |  |  |
Interest rate margin on LIBOR | 1.25% |  |  |
Debentures | Debentures Due 2028 |  |  |  |
Debt Instrument |  |  |  |
Long term debt including current maturities | $ 147.1 |  |  |
Unfavorable Regulatory Action [Member] | 2015 Consent Decrees With EPA [Member] |  |  |  |
Debt Instrument |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 50.0 |  |

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