Financial Instruments (Schedule of Effect of Risk Management) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flow hedges:
Total	$ 216.4	$ 263.0	$ (209.7)
Hedged Fixed Rate Debt
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	324.9	435.0	(404.0)
Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	52.0	213.7	(207.9)
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	29.8	42.3	(53.7)
Foreign Exchange Contract
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	(15.4)	0.0	0.0
Forward-starting interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	391.5	97.6	(110.9)
Designated as Hedging Instrument | Hedged Fixed Rate Debt
Fair value hedges:
Effect from hedged fixed-rate debt	(209.8)	(78.5)	86.9
Designated as Hedging Instrument | Interest Rate Contract
Fair value hedges:
Effect from interest rate contracts	209.8	78.5	(86.9)
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	16.5	16.6	16.4
Designated as Hedging Instrument | Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	8.6	41.8	(102.4)
Not Designated as Hedging Instrument | Foreign Exchange Contract
Cash flow hedges:
Net (gains) losses on foreign currency exchange contracts not designated as hedging instruments	$ 191.3	$ 204.6	$ (123.7)