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Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-term debt	$ 680.8	$ 671.4
Long-term debt, net of debt issuance costs	669.6	671.5
Investments, Fair Value Disclosure	272.8	247.3	$ 238.7	$ 242.3
Foreign currency forward contracts, gross notional value	2,080.0	1,990.0
Foreign currency forward contracts, net notional value	660.0	840.0
Deferred compensation plan, contra-equity, shares held in trust	5.9	5.8
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	9.0	6.7
Derivative Asset, Fair Value, Gross Liability	1.0	0.2
Derivative Liability, Fair Value, Gross Asset	1.0	0.6
Derivative Liability, Fair Value, Gross Liability	11.0	9.2
Long-Term Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized Debt Issuance Expense	3.4	3.7
Fair Value, Measurements, 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	204.1	191.2
Fair Value, Measurements, 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	8.0	6.5
Foreign currency forward contract, current liability amount	10.0	8.6
Deferred compensation plan assets	297.7	258.2
Deferred compensation plan liabilities	$ 296.2	$ 251.8

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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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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