Shareholders' Equity Share Repurchase Plan Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	2 Months Ended	10 Months Ended
Mar. 31, 2015	Feb. 18, 2015	Dec. 31, 2014	Feb. 19, 2015	Feb. 07, 2014
Preferred Stock, Shares Outstanding	0us-gaap_PreferredStockSharesOutstanding		0us-gaap_PreferredStockSharesOutstanding
Stock Repurchased and Retired During Period, Value	$ 3.1		$ 36.7
Stock Repurchased and Retired During Period, Shares	84,000	335,251	910,990
Stock Repurchase Program, Authorized Amount				50	50
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 46.9		$ 13.3
Preferred Stock, No Par Value

Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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 210.5-02.28)

-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 29

-Article 5

+ Details

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- Definition

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

+ References

+ Details

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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Balance Type:	credit
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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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