Share-Based Compensation Plans Share-Based Compensation Plans, Restricted Stock Activity (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 29, 2013	Mar. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 2,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	84,500			155,000	92,000
Allocated Share-based Compensation Expense	11,932,000	21,482,000	13,993,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Trading Days		20 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 5,900,000
Churchill 2004 and 2007 Plan [Member] \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares outstanding, beginning of period	673,000	379,000	419,000
Shares, granted	26,000	611,000	182,000
Shares, vested	346,000	316,000	221,000
Shares cancelled/forfeited	(12,000)	(1,000)	(1,000)
Shares outstanding, end of period	341,000	673,000	379,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Shares outstanding, weighted average grant date fair value, beginning of period	$ 53.64	$ 42.97	$ 40.01
Shares, weighted average grant date fair value, granted	$ 88.58	$ 60.21	$ 51.99
Shares, weighted average grant date fair value, vested	$ 53.70	$ 53.90	$ 44.77
Shares, weighted average grant date fair value, cancelled/forfeited	$ 60.41	$ 38.75	$ 39.12
Shares outstanding, weighted average grant date fair value, end of period	$ 55.77	$ 53.64	$ 42.97
Performance-Based Awards [Member] \| Churchill 2004 and 2007 Plan [Member] \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares outstanding, beginning of period	324,000	60,000	112,000
Shares, granted	0	324,000	0
Shares, vested	239,000	60,000	52,000
Shares cancelled/forfeited	0	0	0
Shares outstanding, end of period	84,500	324,000	60,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Shares outstanding, weighted average grant date fair value, beginning of period	$ 53.71	$ 45.90	$ 43.76
Shares, weighted average grant date fair value, granted	$ 0.00	$ 53.71	$ 0.00
Shares, weighted average grant date fair value, vested	$ 53.49	$ 45.90	$ 41.31
Shares, weighted average grant date fair value, cancelled/forfeited	$ 0.00	$ 0.00	$ 0.00
Shares outstanding, weighted average grant date fair value, end of period	$ 54.32	$ 53.71	$ 45.90
Service Period Awards [Member] \| Churchill 2004 and 2007 Plan [Member] \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares outstanding, beginning of period	349,000	319,000	307,000
Shares, granted	26,000	287,000	182,000
Shares, vested	(107,000)	(256,000)	(169,000)
Shares cancelled/forfeited	(12,000)	(1,000)	(1,000)
Shares outstanding, end of period	256,000	349,000	319,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Shares outstanding, weighted average grant date fair value, beginning of period	$ 53.58	$ 42.42	$ 38.63
Shares, weighted average grant date fair value, granted	$ 88.58	$ 67.55	$ 51.99
Shares, weighted average grant date fair value, vested	$ 54.15	$ 59.54	$ 45.85
Shares, weighted average grant date fair value, cancelled/forfeited	$ 60.41	$ 38.75	$ 39.12
Shares outstanding, weighted average grant date fair value, end of period	$ 56.24	$ 53.58	$ 42.42

Trading Days

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Name Staff Accounting Bulletin (SAB)

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-Section F

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Unrecognized cost of unvested share-based compensation awards.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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-Publisher FASB

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-Topic 718

-SubTopic 10

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-Paragraph 2

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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