Debt (Details 4) (US Dollar notes under the Note Purchase Agreement, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Jan. 31, 2012
Debt
Senior notes		$ 240.0us-gaap_DebtInstrumentFaceAmount
Additional aggregate principal amount that may be issued	600
Minimum percentage of original aggregate principal that may be prepaid	10.00%
Prepayment price as percentage of principal amount	100.00%
Prepayment price as percentage of principal amount, in the event of a change in control	100.00%
Maximum leverage ratio	3.50
Period for interest coverage ratio	1 year
Minimum interest coverage ratio	2.50
Priority debt as a percentage of consolidated net worth	25.00%
Minimum
Debt
Written notice period to holders of the Notes	30 days
Maximum
Debt
Written notice period to holders of the Notes	60 days
3.16% Series 2012A Senior Notes, Tranche A, due January 18, 2017
Debt
Senior notes		20.0
Interest rate, stated percentage		3.16%
3.74% Series 2012A Senior Notes, Tranche B, due January 18, 2019
Debt
Senior notes		15.0
Interest rate, stated percentage		3.74%
4.31% Series 2012A Senior Notes, Tranche C, due January 18, 2022
Debt
Senior notes		105.0
Interest rate, stated percentage		4.31%
4.46% Series 2012A Senior Notes, Tranche D, due January 18, 2024
Debt
Senior notes		$ 100.0
Interest rate, stated percentage		4.46%

The minimum interest coverage ratio required to be maintained under the terms of the debt agreement.

No definition available.

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- Definition

The maximum leverage ratio allowed under the terms of the debt agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the period for sending a written notice to the holders of debt in case of prepayment of the debt.

+ References

No definition available.

+ Details

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- Definition

Minimum percentage of the original aggregate principal amount of the debt that may be prepaid.

+ References

No definition available.

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer in the event of a change in control of the entity.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Represents the period considered for maintenance of the interest coverage ratio.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum priority debt of the entity, expressed as a percentage of consolidated net worth, allowed under the terms of the debt agreement.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Details

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Data Type:	xbrli:stringItemType
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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Subparagraph b

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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