Derivative Instruments and Hedging Activities - Fair Value Balance Sheet (Details) $ in Millions, $ in Millions	Sep. 30, 2023 USD ($)	Jun. 30, 2023 CAD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Derivatives designated as hedging instruments
Derivative asset, fair value, designated as hedging instrument	$ 96.9			$ 47.8
Derivative liability, fair value, designated as hedging instrument	0.0			(0.2)
Derivatives not designated as hedging instruments
Derivative asset, not designated as hedging instrument, fair value	29.9			94.3
Derivative liability, not designated as hedging instrument, fair value	(42.8)			(25.3)
Forward starting interest rate swaps | Designated as hedging instruments | Cash flow hedges
Derivatives designated as hedging instruments
Notional amount	1,000.0			1,000.0
Derivatives not designated as hedging instruments
Notional amount	1,000.0			1,000.0
Foreign currency forwards | Designated as hedging instruments | Cash flow hedges
Derivatives designated as hedging instruments
Notional amount	215.5			176.6
Derivatives not designated as hedging instruments
Notional amount	215.5			176.6
Foreign currency forwards | Not designated as hedging instruments
Derivatives designated as hedging instruments
Notional amount		$ 260	$ 195.0
Derivatives not designated as hedging instruments
Notional amount		$ 260	$ 195.0
Commodity swaps | Not designated as hedging instruments
Derivatives designated as hedging instruments
Notional amount	608.4			525.2
Derivatives not designated as hedging instruments
Notional amount	608.4			525.2
Commodity options | Not designated as hedging instruments
Derivatives designated as hedging instruments
Notional amount				19.7
Derivatives not designated as hedging instruments
Notional amount				19.7
Other non-current assets | Forward starting interest rate swaps
Derivatives designated as hedging instruments
Derivative asset, fair value, designated as hedging instrument	91.9			40.0
Other non-current assets | Foreign currency forwards
Derivatives designated as hedging instruments
Derivative asset, fair value, designated as hedging instrument	1.1			1.6
Other non-current assets | Commodity swaps
Derivatives not designated as hedging instruments
Derivative asset, not designated as hedging instrument, fair value	5.8			7.4
Other current assets | Foreign currency forwards
Derivatives designated as hedging instruments
Derivative asset, fair value, designated as hedging instrument	3.9			6.2
Other current assets | Commodity swaps
Derivatives not designated as hedging instruments
Derivative asset, not designated as hedging instrument, fair value	24.1			86.1
Other current assets | Commodity options
Derivatives not designated as hedging instruments
Derivative asset, not designated as hedging instrument, fair value				0.8
Other liabilities | Forward starting interest rate swaps
Derivatives designated as hedging instruments
Derivative liability, fair value, designated as hedging instrument	0.0			0.0
Other liabilities | Foreign currency forwards
Derivatives designated as hedging instruments
Derivative liability, fair value, designated as hedging instrument	0.0			(0.1)
Other liabilities | Commodity swaps
Derivatives not designated as hedging instruments
Derivative liability, not designated as hedging instrument, fair value	(5.5)			(10.4)
Accounts payable and other current liabilities | Foreign currency forwards
Derivatives designated as hedging instruments
Derivative liability, fair value, designated as hedging instrument	0.0			(0.1)
Accounts payable and other current liabilities | Commodity swaps
Derivatives not designated as hedging instruments
Derivative liability, not designated as hedging instrument, fair value	$ (37.3)			(14.1)
Accounts payable and other current liabilities | Commodity options
Derivatives not designated as hedging instruments
Derivative liability, not designated as hedging instrument, fair value				$ (0.8)