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.

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Unrecognized cost of unvested share-based compensation awards.

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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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

Weighted average price of options that were either forfeited or expired.

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Percentage of vesting of share-based compensation awards.

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Share-Based Compensation Restricted Stock Activity (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended		12 Months Ended
	Mar. 31, 2016	Apr. 30, 2015	Feb. 28, 2015	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Weighted Average Grant Date Fair Value, Unvested						$ 56.38	$ 50.59		$ 43.87	$ 41.14
Unvested restricted shares						841,634	813,260		688,743	631,956
Granted shares						227,800	216,800	117,250
Weighted Average Grant Date Fair Value		$ 63.81				$ 69.43	$ 64.32	$ 49.97
Vested in Period						(165,631)	(85,021)	(55,488)
Weighted Average Grant Date Fair Value, Vested						$ 45.90	$ 31.89	$ 25.57
Forfeited in Period						(33,795)	(7,262)	(4,975)
Weighted Average Exercise Price, Forfeitures						$ 56.49	$ 45.94	$ 38.45
Share-based Compensation Expense						$ 9.6	$ 7.1	$ 4.9
Compensation Cost Not yet Recognized						32.0
Vested in Period, Total Fair Value						7.6	$ 2.7	$ 1.4
Within 12 Months [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Compensation Cost Not yet Recognized						9.7
More than One and within Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Compensation Cost Not yet Recognized						8.2
More than Two and Within Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Compensation Cost Not yet Recognized						5.8
More than three years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Compensation Cost Not yet Recognized						$ 8.3
Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted shares					130,000	81,000	6,000
Weighted Average Grant Date Fair Value					$ 69.25	$ 69.70	$ 66.10
2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted shares		145,000					45,000
Weighted Average Grant Date Fair Value							$ 65.00
Director [Member] \| Director Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted shares	16,800		19,800
Weighted Average Grant Date Fair Value	$ 69.45		$ 65.87
Share-based Compensation Award, Tranche One [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage				35.00%	20.00%	35.00%
Share-based Compensation Award, Tranche One [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage		20.00%					35.00%
Share-based Compensation Award, Tranche Two [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage				35.00%	30.00%	35.00%
Share-based Compensation Award, Tranche Two [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage		30.00%					35.00%
Share-based Compensation Award, Tranche Three [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage				20.00%	35.00%	20.00%
Share-based Compensation Award, Tranche Three [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage		35.00%					20.00%
Share-based Compensation Award, Tranche Four [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage				5.00%	10.00%	5.00%
Share-based Compensation Award, Tranche Four [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage		10.00%					5.00%
Share-based Compensation Award, Tranche Five [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage				5.00%	5.00%	5.00%
Share-based Compensation Award, Tranche Five [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Award Vesting Rights, Percentage		5.00%					5.00%
Share-based Compensation Award, Tranche Six [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted shares		72,500			65,000