Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Revolving credit facility		$ 0.0	$ 0.0
Commercial paper	[1]	447.7	337.2
Term loan			15.6
Capital leases		0.4	0.7
Total long-term debt		1,245.4	1,150.1
Less: current portion		(0.3)	(16.0)
Long-term debt, less current portion		$ 1,245.1	1,134.1
Commercial Paper
Debt Instrument [Line Items]
Commercial paper borrowings weighted average interest rate, as a percent		1.01%
Senior Notes 2017
Debt Instrument [Line Items]
Senior notes, noncurrent		$ 299.5	$ 299.1
Senior notes, interest rate, as a percent		2.00%	2.00%
Senior Notes 2022
Debt Instrument [Line Items]
Senior notes, noncurrent		$ 497.8	$ 497.5
Senior notes, interest rate, as a percent		3.45%	3.45%

[1] Committed credit available under our revolving credit facility provided the ability to refinance our commercial paper obligations on a long-term basis. As we have both the ability and intent to refinance these obligations on a long-term basis, our commercial paper borrowings were classified as long-term in the condensed consolidated balance sheets at September 30, 2016 and December 31, 2015. As of September 30, 2016, our commercial paper borrowings had a weighted average interest rate of 1.01%.