Share-Based Compensation Plans - Stock activity - RSUs, PSUs, MSUs (Details) (USD $)	3 Months Ended
Mar. 31, 2015
Performance Shares PSU [Member]
Nonvested share activity [Rollforward]
Nonvested beginning balance	343,600
Granted	189,300
Cancelled	(9,400)
Vested	0
Nonvested ending balance	523,500
Weighted-average grant-date fair value [Rollforward]
Nonvested beginning balance	$ 24.06
Granted	$ 28.93
Cancelled	$ 24.04
Vested	$ 0
Nonvested ending balance	$ 25.82
Restricted Stock Units [Member]
Nonvested share activity [Rollforward]
Nonvested beginning balance	367,100
Granted	101,000
Cancelled	(13,100)
Vested	(34,100)
Nonvested ending balance	420,900
Weighted-average grant-date fair value [Rollforward]
Nonvested beginning balance	$ 25.87
Granted	$ 26.09
Cancelled	$ 26.19
Vested	$ 26.81
Nonvested ending balance	$ 25.84
Market Share Units MSU [Member]
Nonvested share activity [Rollforward]
Nonvested beginning balance	163,300
Granted	108,600
Cancelled	0
Vested	0
Nonvested ending balance	271,900
Weighted-average grant-date fair value [Rollforward]
Nonvested beginning balance	$ 25.47
Granted	$ 30.37
Cancelled	$ 0
Vested	$ 0
Nonvested ending balance	$ 27.42

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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- Definition

Number of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

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- Definition

Number of options vested.

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No definition available.

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- Definition

Weighted average grant-date fair value of options vested.

+ References

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