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Long-Term Debt And Notes Payable (Components Of Debt) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.00% |  |
Net decrease in short-term debt | $ 0.0 | $ 28.5 |
Long-term debt | $ 745.5 |  | $ 745.3
2.75% Notes Due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Year Of Debt Instrument | 2018 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  | 2.75%
Long-term debt | $ 249.3 |  | $ 249.2
Debt Instrument, Face Amount | 250.0 |  | 250.0
Amortization of Debt Issuance Costs | (0.7) |  | (0.8)
Six Point Five Five Percent Notes Due 2036 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 198.0 |  | 198.0
Debt Instrument, Face Amount | 200.0 |  | 200.0
Amortization of Debt Issuance Costs | (1.3) |  | (1.3)
Debt Instrument, Unamortized Discount | (0.7) |  | (0.7)
Four Point Four Five Percent Notes Due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 298.2 |  | 298.1
Debt Instrument, Face Amount | 300.0 |  | 300.0
Amortization of Debt Issuance Costs | $ (1.8) |  | $ (1.9)
4.45% Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Year Of Debt Instrument | 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.45% |  | 4.45%
6.55% Notes Due 2036 |  |  |
Debt Instrument [Line Items] |  |  |
Maturity Year Of Debt Instrument | 2036 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.55% |  | 6.55%

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