Financing Arrangements, Interest Rates and Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Effective interest rate	5.23%
Finance Lease, Liability	$ 14.8	$ 16.2
Debt issuance costs	(7.3)	(5.5)
Total debt, finance lease obligations, and notes payable	1,331.3	1,450.7
Less: current maturities	53.1	142.1
Total long-term debt, finance lease obligations, and notes payable	$ 1,278.2	1,308.6
Revolving Credit Facility
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.00%
Senior Notes \| Senior Unsecured Notes 4.60% Due May 2021
Debt Instrument [Line Items]
Stated interest rate	4.60%
Long-term debt	$ 0.0	75.0
Senior Notes \| Senior Unsecured Notes 4.23% Due July 2028
Debt Instrument [Line Items]
Stated interest rate	4.23%
Long-term debt	$ 350.0	350.0
Notes payable and other
Debt Instrument [Line Items]
Stated interest rate	4.25%
Long-term debt	$ 73.8	75.0
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving loan facility	$ 0.0	0.0
Term loan
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	1.23%
Revolving loan facility	$ 900.0	$ 940.0

Amount of short-term and long-term debt and lease obligation.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate at the end of the reporting period.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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