Financial Instruments (Schedule of Effect of Risk Management) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flow hedges:
Total	$ (68.7)	$ 216.4	$ 263.0
Hedged Fixed Rate Debt
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	(219.9)	324.9	435.0
Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	(27.4)	52.0	213.7
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	15.2	29.8	42.3
Foreign Exchange Contract
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	(107.1)	(15.4)	0.0
Forward-starting interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	85.6	391.5	97.6
Designated as Hedging Instrument | Hedged Fixed Rate Debt
Fair value hedges:
Effect from hedged fixed-rate debt	31.5	(209.8)	(78.5)
Designated as Hedging Instrument | Interest Rate Contract
Fair value hedges:
Effect from interest rate contracts	(31.5)	209.8	78.5
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	13.5	16.5	16.6
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	(108.6)	8.6	41.8
Not Designated as Hedging Instrument | Foreign Exchange Contract
Cash flow hedges:
Net losses on foreign currency exchange contracts not designated as hedging instruments	$ 26.4	$ 191.3	$ 204.6