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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 EUR (€)	Mar. 31, 2021 JPY (¥)	Mar. 31, 2021 GBP (£)	Dec. 31, 2020 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	$ 4,300.0					$ 4,500.0
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted	13.00%		13.00%	13.00%	13.00%
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months	$ 16.9
Alternative investments, unfunded commitments	$ 736.0
Alternative investments, unfunded commitments, payment period	10 years
Equity securities, net unrealized gains	$ 301.5	$ 186.6
Available-for-sale, percentage of nonperforming assets	94.00%
Amount of receivable derecognized	$ 637.8					754.9
Buy U.S. Dollars Sell Euros
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount	1,110.0
Derivative asset, notional amount | €			€ 941.7
Buy Euros Sell U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount | €			€ 4,190.0
Derivative asset, notional amount	4,980.0
Buy U.S. Dollars Sell Japanese Yen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount	140.7
Derivative asset, notional amount | ¥				¥ 15,470
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 | £					£ 285.2
Derivative asset, notional amount	396.5
Swap U.S. Dollars to Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	3,790.0
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
Foreign Currency Denominated Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current portion	5,720.0					$ 6,020.0
Designated as Hedging Instrument | Cash Flow Hedging | Forward-starting interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	$ 1,750.0

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