Investments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Short-term investments:
Short-term investments	$ 114.4	$ 136.7
Certificates of deposit
Short-term investments:
Investments, Cost Basis	114.4	136.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax	0	0
Short-term investments	114.4	136.7
Assets held in rabbi trusts [Member]
Long-term investments:
Long-term investments, Cost Basis	9.1	9.3
Long-term investments, Unrealized (Loss) Gain	(0.7)	(0.5)
Fair Value, Measurements, Recurring [Member] \| Assets held in rabbi trusts [Member]
Long-term investments:
Fair Value Of Assets Held Under Trust	9.8	9.8
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	9.8	9.8
Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Long-term investments:
Investments, Fair Value Disclosure	114.4	136.7
Certificates of deposit \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Long-term investments:
Investments, Fair Value Disclosure	$ 114.4

Fair value of assets held under trust.

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Long-term investments amortized cost.

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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

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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