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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 EUR (€)	Jun. 30, 2021 JPY (¥)	Jun. 30, 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	$ 4,360.0		$ 4,360.0					$ 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%	13.00%
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months	$ 17.0		$ 17.0
Alternative investments, unfunded commitments	758.0		$ 758.0
Alternative investments, unfunded commitments, payment period			10 years
Equity securities, net unrealized gains	215.4	$ 576.8	$ 517.0	$ 763.4
Available-for-sale, percentage of nonperforming assets			98.00%
Amount of receivable derecognized	694.3		$ 694.3					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	1,970.0		1,970.0
Derivative asset, notional amount | €					€ 1,650
Buy Euros Sell U.S. Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount | €					€ 2,550
Derivative asset, notional amount	3,050.0		3,050.0
Buy U.S. Dollars Sell Japanese Yen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount	190.8		190.8
Derivative asset, notional amount | ¥						¥ 21,100
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 | £							£ 250.4
Derivative asset, notional amount	349.4		349.4
Swap U.S. Dollars to Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	3,820.0		3,820.0
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		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	5,800.0		5,800.0					$ 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		$ 1,750.0

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