Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 29, 2017	Dec. 31, 2016	Oct. 31, 2013	Jun. 30, 2012	Jul. 27, 2010
Debt Instrument
Total long-term debt	$ 3,640.6		$ 2,552.9
Less: current portion	(473.2)		(683.6)
Long-term debt, less current portion	$ 3,167.4		$ 1,869.3
2.00% Senior Notes due 2017
Debt Instrument
Interest rate, stated percentage	2.00%		2.00%
3.45% Senior Notes due 2022
Debt Instrument
Interest rate, stated percentage	3.45%		3.45%
5.00% Notes due 2020
Debt Instrument
Interest rate, stated percentage	5.00%		5.00%
3.40% Notes due 2022
Debt Instrument
Interest rate, stated percentage	3.40%		3.40%
3.15% Notes due 2023
Debt Instrument
Interest rate, stated percentage	3.15%		3.15%
3.15% Notes due 2023
Debt Instrument
Interest rate, stated percentage	3.15%		3.15%
4.00% Notes due 2027
Debt Instrument
Interest rate, stated percentage	4.00%		4.00%
4.00% Notes due 2032
Debt Instrument
Interest rate, stated percentage	4.00%		4.00%
3.75% Notes due 2033
Debt Instrument
Interest rate, stated percentage	3.75%		3.75%
Line of Credit | Revolving credit facility
Debt Instrument
Long-term debt	$ 0.0		$ 0.0
Line of Credit | Bilateral credit facilities
Debt Instrument
Long-term debt	0.0		0.0
Commercial paper
Debt Instrument
Long-term debt	839.8		210.8
Synthetic bonds due 2021
Debt Instrument
Long-term debt	$ 490.9		428.0
Convertible bonds due 2017
Debt Instrument
Long-term debt			$ 524.5
Senior Notes | 2.00% Senior Notes due 2017
Debt Instrument
Interest rate, stated percentage	2.00%	2.00%	2.00%
Long-term debt	$ 300.0
Senior Notes | 3.45% Senior Notes due 2022
Debt Instrument
Interest rate, stated percentage	3.45%	3.45%	3.45%
Long-term debt	$ 500.0
Private Placement Notes | 5.00% Notes due 2020
Debt Instrument
Interest rate, stated percentage	5.00%		5.00%			5.00%
Long-term debt	$ 236.3		$ 209.7
Private Placement Notes | 3.40% Notes due 2022
Debt Instrument
Interest rate, stated percentage	3.40%		3.40%		3.40%
Long-term debt	$ 177.9		$ 158.0
Private Placement Notes | 3.15% Notes due 2023
Debt Instrument
Interest rate, stated percentage	3.15%		3.15%	3.15%
Long-term debt	$ 153.3		$ 136.1
Private Placement Notes | 3.15% Notes due 2023
Debt Instrument
Interest rate, stated percentage	3.15%		3.15%	3.15%
Long-term debt	$ 148.1		$ 131.4
Private Placement Notes | 4.00% Notes due 2027
Debt Instrument
Interest rate, stated percentage	4.00%		4.00%		4.00%
Long-term debt	$ 88.9		$ 79.0
Private Placement Notes | 4.00% Notes due 2032
Debt Instrument
Interest rate, stated percentage	4.00%		4.00%		4.00%
Long-term debt	$ 114.1		$ 101.2
Private Placement Notes | 3.75% Notes due 2033
Debt Instrument
Interest rate, stated percentage	3.75%		3.75%	3.75%
Long-term debt	$ 114.8		$ 101.8
Bank borrowings
Debt Instrument
Long-term debt	437.0		452.1
Other
Debt Instrument
Long-term debt	$ 39.5		$ 20.3