Derivative Instruments and Hedging Activities - Fair Value Balance Sheet (Details) $ in Millions, $ in Millions	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Derivatives designated as hedging instruments:
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	$ 42.7			$ 47.8
Derivative liability, fair value, designated as hedging instrument	(2.5)			(0.2)
Derivatives designated as hedging instruments: | Forward starting interest rate swaps | Other Noncurrent Assets
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	41.6			40.0
Derivatives designated as hedging instruments: | Forward starting interest rate swaps | Other Liabilities
Derivatives designated as hedging instruments:
Derivative liability, fair value, designated as hedging instrument	0.0			0.0
Derivatives designated as hedging instruments: | Foreign currency forwards | Other Current Assets
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	1.1			6.2
Derivatives designated as hedging instruments: | Foreign currency forwards | Other Noncurrent Assets
Derivatives designated as hedging instruments:
Derivative asset, fair value, designated as hedging instrument	0.0			1.6
Derivatives designated as hedging instruments: | Foreign currency forwards | Accounts payable and other current liabilities
Derivatives designated as hedging instruments:
Derivative liability, fair value, designated as hedging instrument	(1.2)			(0.1)
Derivatives designated as hedging instruments: | Foreign currency forwards | Other Liabilities
Derivatives designated as hedging instruments:
Derivative liability, fair value, designated as hedging instrument	(1.3)			(0.1)
Derivatives not designated as hedging instruments:
Derivatives not designated as hedging instruments:
Derivative asset, not designated as hedging instrument, fair value	17.9			94.3
Derivative liability, not designated as hedging instrument, fair value	(48.3)			(25.3)
Derivatives not designated as hedging instruments: | Foreign currency forwards
Derivatives designated as hedging instruments:
Notional amount		$ 195.0	$ 260
Derivatives not designated as hedging instruments:
Notional amount		$ 195.0	$ 260
Derivatives not designated as hedging instruments: | Commodity swaps
Derivatives designated as hedging instruments:
Notional amount	653.5			525.2
Derivatives not designated as hedging instruments:
Notional amount	653.5			525.2
Derivatives not designated as hedging instruments: | Commodity swaps | Other Current Assets
Derivatives not designated as hedging instruments:
Derivative asset, not designated as hedging instrument, fair value	11.1			86.1
Derivatives not designated as hedging instruments: | Commodity swaps | Other Noncurrent Assets
Derivatives not designated as hedging instruments:
Derivative asset, not designated as hedging instrument, fair value	6.6			7.4
Derivatives not designated as hedging instruments: | Commodity swaps | Accounts payable and other current liabilities
Derivatives not designated as hedging instruments:
Derivative liability, not designated as hedging instrument, fair value	(42.0)			(14.1)
Derivatives not designated as hedging instruments: | Commodity swaps | Other Liabilities
Derivatives not designated as hedging instruments:
Derivative liability, not designated as hedging instrument, fair value	(6.1)			(10.4)
Derivatives not designated as hedging instruments: | Commodity options
Derivatives designated as hedging instruments:
Notional amount	21.7			19.7
Derivatives not designated as hedging instruments:
Notional amount	21.7			19.7
Derivatives not designated as hedging instruments: | Commodity options | Other Current Assets
Derivatives not designated as hedging instruments:
Derivative asset, not designated as hedging instrument, fair value	0.2			0.8
Derivatives not designated as hedging instruments: | Commodity options | Accounts payable and other current liabilities
Derivatives not designated as hedging instruments:
Derivative liability, not designated as hedging instrument, fair value	(0.2)			(0.8)
Cash Flow Hedges | Derivatives designated as hedging instruments: | Forward starting interest rate swaps
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
Cash Flow Hedges | Derivatives designated as hedging instruments: | Foreign currency forwards
Derivatives designated as hedging instruments:
Notional amount	219.4			176.6
Derivatives not designated as hedging instruments:
Notional amount	$ 219.4			$ 176.6