CONSOLIDATED BALANCE SHEETS (Parentheticals) $ in Thousands, shares in Millions	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 £ / shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 £ / shares
Statement of Financial Position [Abstract]
Allowances for doubtful accounts	$ 8,244		$ 10,230
Reserves for inventories	63,008		69,459
Accumulated depreciation of property, plant and equipment	395,611		367,954
Accumulated amortization of intangible assets	$ 1,896,660		$ 1,599,573
Common stock, nominal value | £ / shares		£ 0.01		£ 0.01
Common stock, shares issued | shares	173.9		185.2
Common stock, shares outstanding | shares	173.9		185.2