Stock Based Compensation Plans - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 CompensationPlan	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of compensation plans	4
Compensation cost not yet recognized	$ 9.4
Weighted average years for amortization	1 year 6 months
Non cash compensation expense	17.0us-gaap_ShareBasedCompensation	17.0us-gaap_ShareBasedCompensation	12.4us-gaap_ShareBasedCompensation
Excess tax benefit on stock options exercised	18.5	13.1	14.6
Tax benefit from stock options exercised	18.8	13.4	15.4
Exercise Options Granted In Two Thousand Seven Or Latter Within Three Year From Date Of Termination
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Minimum required participant age and years of service	65 years
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock exercise period, years	10 years
Vesting period	3 years
Minimum service period, years	5 years
Minimum required participant age with five years of service	55 years
Non cash compensation expense	17.0	17.0	12.4
Excess tax benefit on stock options exercised	$ 18.5	$ 13.1	$ 14.6

Minimum required sum of the participant’s age and years of service.

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Minimum required participant age with five years service.

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Share based compensation arrangement by share based payment number of plans.

+ References

No definition available.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

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-Publisher FASB

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-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

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-Topic 718

-SubTopic 10

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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