Accounts and Other Receivables (Allowance For Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020	Jan. 01, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 42.0
Add: Charges	(3.4)	$ 17.1	$ 2.8
Less: Net Charge-offs/(Recoveries) and Other	1.6	1.9
Ending Balance	37.0	42.0
Allowance for credit loss	37.0	42.0
Retained earnings	2,973.0	2,797.2			$ 49.2
Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss				$ 3.3
Retained earnings				$ 2.5
Adjusted balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	26.8
Ending Balance		26.8
Allowance for credit loss		26.8
Trade accounts receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19.2
Add: Charges	(2.7)	9.4
Less: Net Charge-offs/(Recoveries) and Other	1.6	1.9
Ending Balance	14.9	19.2
Allowance for credit loss	14.9	19.2
Trade accounts receivable | Adjusted balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11.7
Ending Balance		11.7
Allowance for credit loss		11.7
Trade notes receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0.0
Add: Charges	0.1	(0.1)
Less: Net Charge-offs/(Recoveries) and Other	0.0	0.0
Ending Balance	0.1	0.0
Allowance for credit loss	0.1	0.0
Trade notes receivable | Adjusted balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0.1
Ending Balance		0.1
Allowance for credit loss		0.1
Total trade receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	19.2
Add: Charges	(2.6)	9.3
Less: Net Charge-offs/(Recoveries) and Other	1.6	1.9
Ending Balance	15.0	19.2
Allowance for credit loss	15.0	19.2
Total trade receivables | Adjusted balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11.8
Ending Balance		11.8
Allowance for credit loss		11.8
Other notes receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	22.8
Add: Charges	(0.8)	7.8
Less: Net Charge-offs/(Recoveries) and Other	0.0	0.0
Ending Balance	22.0	22.8
Allowance for credit loss	22.0	22.8
Other notes receivable | Adjusted balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 15.0
Ending Balance		15.0
Allowance for credit loss		$ 15.0