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Employee Benefits (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Employee Benefits
Weighted-average asset allocations (as a percent)	100.00%	100.00%
Target allocation
Fair value of plan assets	$ 70.2	$ 58.9
Level 1
Target allocation
Fair value of plan assets	55.1	42.3
Level 2
Target allocation
Fair value of plan assets	15.1	16.6
U.S. government, state, and agency
Target allocation
Fair value of plan assets	6.3	8.1
U.S. government, state, and agency | Level 2
Target allocation
Fair value of plan assets	6.3	8.1
Corporate debt securities
Target allocation
Fair value of plan assets	8.4	7.9
Corporate debt securities | Level 2
Target allocation
Fair value of plan assets	8.4	7.9
Mutual funds
Target allocation
Fair value of plan assets	28.3	18.6
Mutual funds | Level 1
Target allocation
Fair value of plan assets	27.9	18.0
Mutual funds | Level 2
Target allocation
Fair value of plan assets	0.4	0.6
Interest and non-interest bearing cash
Target allocation
Fair value of plan assets	1.6	1.6
Interest and non-interest bearing cash | Level 1
Target allocation
Fair value of plan assets	1.6	1.6
Equity securities
Employee Benefits
Weighted-average asset allocations (as a percent)	61.00%	61.00%
Target allocation
Target allocation, minimum (as a percent)	50.00%
Target allocation, maximum (as a percent)	80.00%
Fair value of plan assets	25.6	22.7
Equity securities | Level 1
Target allocation
Fair value of plan assets	$ 25.6	$ 22.7
Debt securities
Employee Benefits
Weighted-average asset allocations (as a percent)	37.00%	36.00%
Target allocation
Target allocation, minimum (as a percent)	20.00%
Target allocation, maximum (as a percent)	60.00%
Other
Employee Benefits
Weighted-average asset allocations (as a percent)	2.00%	3.00%
Target allocation
Target allocation, minimum (as a percent)	0.00%
Target allocation, maximum (as a percent)	10.00%

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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-Publisher FASB

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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-Publisher FASB

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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