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For the form of debt having an initial term beyond one year or beyond the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term beyond one year or beyond the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

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

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Face (par) amount of debt instrument at time of issuance.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The number of derivative instruments of a particular group held by the entity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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 capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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Debt (Details) - USD ($) $ in Millions	12 Months Ended
Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Weighted average interest rate	2.40%
Long-term Debt	$ 1,350.4	$ 1,547.4
Commercial paper, maximum amount outstanding during period	311.3
Commercial paper, average outstanding amount	216.4
Line of credit, maximum borrowing capacity	1,100.0
Line of Credit Facility, Maximum Borrowing Capacity, Multicurrency Limit	100.0
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(2.7)	2.4	$ 3.9
Current portion of long-term debt	1.8	5.0
Long-term Debt and Capital Lease Obligations	1,348.6	1,542.4
Long-term Debt, Fiscal Year Maturity [Abstract]
2018	451.8
2019	1.4
2020	401.4
2021	201.4
2022	$ 0.8
Notes Payable 3.1 Percent Due 2026 [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.10%
Long-term Debt	$ 300.0	300.0
Debt instrument, face amount	300.0
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	7.7	15.8
Interest-rate swap
Debt Instrument [Line Items]
Long-term Debt	(2.7)	(0.6)
Unamortized discounts and debt issuance costs [Member]
Debt Instrument [Line Items]
Long-term Debt	$ (4.6)	(6.0)
Commercial Paper [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.10%
Long-term Debt	$ 50.0	238.2
Notes Payable 6.8 Percent Due 2019 [Member]
Debt Instrument [Line Items]
Weighted average interest rate	6.80%
Long-term Debt	$ 400.0	400.0
Notes Payable 4.5 Percent Due 2021 [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.50%
Long-term Debt	$ 400.0	400.0
Debt instrument, face amount	$ 400.0
Fixed-rate (as a percent)	4.50%
Note Payable LIBOR plus fixed spread due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 200.0	200.0
Debt instrument, face amount	200.0
Interest-rate swap \| Measured on a recurring basis \| (Level 2)
Debt Instrument [Line Items]
Derivative Asset	0.0	0.0
Derivative Liability	$ (2.7)	(0.6)
Derivatives designated as hedging instruments \| Interest-rate swap
Debt Instrument [Line Items]
Number of swap agreements	4
Notional amounts of derivatives	$ 400.0
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (1.7)	$ 3.2	$ 4.7