Stock Based Compensation Plans - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($) CompensationPlan	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of compensation plans \| CompensationPlan	4
Compensation cost not yet recognized	$ 8.4
Period of amortization expected to be recognized	3 years
Non-cash compensation expense	$ 16.1	$ 17.0	$ 17.0
Excess tax benefit on stock options exercised	15.8	18.5	13.1
Tax benefit from stock options exercised	$ 15.8	18.8	13.4
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	$ 16.1	17.0	17.0
Excess tax benefit on stock options exercised	$ 15.8	$ 18.5	$ 13.1

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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- Definition

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

+ References

No definition available.

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- Definition

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
-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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

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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.

+ References

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- Definition

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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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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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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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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