Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Mar. 29, 2017	Dec. 31, 2016	Oct. 31, 2013	Jun. 30, 2012	Jul. 27, 2010
Debt Instrument [Line Items]
Unamortized debt issuance costs and discounts		$ (13.8)		$ (14.2)
Total debt		3,855.0		2,552.9
Less: current borrowings		(77.1)		(683.6)
Long-term debt		3,777.9		1,869.3
Commercial paper
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	1,450.4		210.8
Synthetic bonds due 2021
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 502.4		431.8
Convertible debt
Debt Instrument [Line Items]
Long-term Debt, Gross				$ 524.5
Senior notes | 3.45% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate, stated percentage		3.45%	3.45%	3.45%
Long-term Debt, Gross		$ 500.0
Unsecured debt | 5.00% Notes due 2020
Debt Instrument [Line Items]
Interest rate, stated percentage		5.00%		5.00%			5.00%
Long-term Debt, Gross		$ 239.9		$ 210.8
Unsecured debt | 3.40% Notes due 2022
Debt Instrument [Line Items]
Interest rate, stated percentage		3.40%		3.40%		3.40%
Long-term Debt, Gross		$ 179.9		$ 158.1
Unsecured debt | 3.15% Notes due 2023
Debt Instrument [Line Items]
Interest rate, stated percentage		3.15%		3.15%	3.15%
Long-term Debt, Gross		$ 155.9		$ 137.0
Unsecured debt | 3.15% Notes due 2023
Debt Instrument [Line Items]
Interest rate, stated percentage		3.15%		3.15%	3.15%
Long-term Debt, Gross		$ 149.9		$ 131.8
Unsecured debt | 4.00% Notes due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage		4.00%		4.00%		4.00%
Long-term Debt, Gross		$ 89.9		$ 79.1
Unsecured debt | 4.00% Notes due 2032
Debt Instrument [Line Items]
Interest rate, stated percentage		4.00%		4.00%		4.00%
Long-term Debt, Gross		$ 119.9		$ 105.4
Unsecured debt | 3.75% Notes due 2033
Debt Instrument [Line Items]
Interest rate, stated percentage		3.75%		3.75%	3.75%
Long-term Debt, Gross		$ 119.9		$ 105.4
Bank borrowings
Debt Instrument [Line Items]
Long-term Debt, Gross		332.5		452.1
Other
Debt Instrument [Line Items]
Long-term Debt, Gross		28.2		20.3
Revolving credit facility | Line of Credit
Debt Instrument [Line Items]
Long-term Debt, Gross		0.0		0.0
Bilateral credit facilities | Line of Credit
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 0.0		$ 0.0

[1] At December 31, 2017 and 2016, committed credit available under our revolving credit facility provided the ability to refinance our commercial paper obligations on a long-term basis.