Long-Term Debt And Notes Payable (Components Of Debt) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total Long-term debt		$ 749.3	$ 749.2
Short-term borrowings		49.6	100.8
5.50% Notes Due 2013 [Member]
Debt Instrument [Line Items]
Total Long-term debt	[1]	250.0	250.0
2.75% Notes Due 2018 [Member]
Debt Instrument [Line Items]
Total Long-term debt		300.0	300.0
4.45% Notes Due 2023 [Member]
Debt Instrument [Line Items]
Total Long-term debt		199.3	1,199.2
6.55% Notes Due 2036 [Member]
Debt Instrument [Line Items]
Total Long-term debt		749.3	749.2
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total Long-term debt			100.0
Commercial Paper [Member]
Debt Instrument [Line Items]
Total Long-term debt		49.0
Other Liabilities [Member]
Debt Instrument [Line Items]
Total Long-term debt		$ 0.6	$ 0.8

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