Debt - Schedule of Total Debt Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding Principal	$ 1,981.8	$ 1,637.7
Issuance Costs and Fees	13.8	15.4
Long-Term Debt, Net	1,968.0	1,622.3
Issuance Costs and Fees	0.0	0.0
Current maturities of long-term debt	7.0	4.0
Total principal amount of debt, net of current maturities	1,974.8	1,633.7
Total debt, net of current maturities	1,961.0	1,618.3
2027 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Outstanding Principal	600.0	600.0
Issuance Costs and Fees	5.7	6.8
Long-Term Debt, Net	594.3	593.2
2028 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Outstanding Principal	700.0	500.0
Issuance Costs and Fees	1.9	5.4
Long-Term Debt, Net	698.1	494.6
Term Loan \| Term Loan B due 2024 \| Line of Credit
Debt Instrument [Line Items]
Outstanding Principal	384.0	388.0
Issuance Costs and Fees	2.4	3.2
Long-Term Debt, Net	381.6	384.8
Term Loan \| Term Loan B-1
Debt Instrument [Line Items]
Outstanding Principal	297.8
Issuance Costs and Fees	3.8
Long-Term Debt, Net	$ 294.0
Term Loan \| Revolver \| Line of Credit
Debt Instrument [Line Items]
Outstanding Principal		149.7
Issuance Costs and Fees		0.0
Long-Term Debt, Net		$ 149.7

Long-term Debt, Excluding Current Maturities, Gross

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Unamortized Debt Issuance Expense, Current

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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