Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 JPY (¥)	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum remaining maturity of foreign currency derivatives		30 days
Derivatives used in net investment hedge, net of tax					$ 2,330.0		$ 2,380.0
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted				15.00%	15.00%	15.00%
Interest rate cash flow hedge losses to be reclassified during next 12 months					$ 16.1
Equity securities, net unrealized gains and (losses)		$ 149.6	$ 18.7
OTTI recognized		$ 0.0	$ 0.0
Available-for-sale, percentage of nonperforming assets		60.00%
Amount of receivable derecognized					638.3		696.2
Buy U.S. Dollars Sell Euros
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount					1,220.0
Derivative asset, notional amount | €				€ 1,080
Buy Euros Sell U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount | €				€ 1,970
Derivative asset, notional amount					2,230.0
Buy U.S. Dollars Sell Japanese Yen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount					356.8
Derivative asset, notional amount | ¥						¥ 39,580
Buy British Pounds and Sell U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount					309.7
Derivative asset, notional amount					409.1
Swap U.S. Dollars to Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount					1,860.0
Swap Swiss Francs to U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount					1,000.0
Swap U.S. Dollars to British Pounds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount					350.0
Foreign Currency Denominated Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current portion					$ 3,330.0		$ 3,400.0
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from issuance of notes	$ 4,450.0
Senior Notes Due March 2029 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 1,150.0
Stated interest rate	3.38%
Senior Notes Due March 2039 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 850.0
Stated interest rate	3.88%
Senior Notes Due March 2049 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 1,500.0
Stated interest rate	3.95%
Senior Notes Due March 2059 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 1,000.0
Stated interest rate	4.15%