Investments (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Assets held in rabbi trusts [Member]
Long-term investments:
Assets held in a rabbi trust	$ 6.1	$ 6.5
Long-term investments, unrealized gain	0.5	(0.2)
Certificates of deposit
Short-term investments:
Investments, Cost Basis	31.5	33.5
Short-term investments, unrealized gain	0.0	0.0
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Short-term investments:
Fair value of assets held under trust	31.5	33.5
Short-term investments \| Certificates of deposit \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Short-term investments:
Fair value of assets held under trust	31.5	33.5
Other liabilities \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member] \| Assets held in rabbi trusts [Member]
Long-term investments:
Fair Value Of Assets Held Under Trust	6.6	$ 6.3
Kony, Inc. [Member]
Debt Securities, Available-for-sale [Line Items]
Cost Method Investments	$ 14.0

Fair value of assets held under trust.

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- Definition

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 2
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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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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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