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Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	$ 2,150.0	$ 2,340.0
Fair value of long-term debt	706.0	723.7
Long-term debt, net of debt issuance costs	687.9	702.0
Investments, Fair Value Disclosure	505.0	340.3	$ 304.1	$ 328.6
Foreign currency forward contracts, net notional value	1,170.0	1,420.0
Deferred compensation plan, contra-equity, shares held in trust	5.3	5.6
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	11.1	13.5
Derivative Asset, Fair Value, Gross Liability	2.4	0.4
Derivative Liability, Fair Value, Gross Asset	1.0	2.7
Derivative Liability, Fair Value, Gross Liability	18.3	6.1
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	2.1	2.5
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	234.8	203.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0	0.0
Foreign currency forward contract, current asset amount	8.7	13.1
Foreign currency forward contract, current liability amount	17.3	3.4
Deferred compensation plan assets	503.5	446.3
Deferred compensation plan liabilities	$ 475.4	$ 427.6

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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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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