Share-Based Payments - Textual (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value per share (in dollars per share)	$ 14.57	$ 11.55	$ 11.55
Unrecognized compensation cost	$ 1.6
Intrinsic value of stock options exercised	$ 5.2	$ 29.0	$ 9.1
2008 Amended and Restated Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under the Plan (shares)	9,000,000	9,000,000
2016 Omnibus Performance Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under the Plan (shares)	14,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Vesting period	3 years
Share-based compensation expense	$ 1.1	$ 0.8	$ 1.6
Weighted-average recognition period for unrecognized compensation cost	21 months
Employment Based SARS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period (shares)	122,976
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 56.2	$ 26.0	5.8
Weighted-average recognition period for unrecognized compensation cost	12 months
Unrecognized compensation cost related to unvested SARs	$ 9.7
Weighted-average fair value per share of awards granted (in dollars per share)	$ 419.28	$ 199.41
Fair value of SARs	$ 87.0
Outstanding awards (shares)	231,092
Performance and Employment Based SARS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period (shares)	129,124
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 27.1	$ 19.6	$ 18.7
Weighted-average recognition period for unrecognized compensation cost	20 months
Unrecognized compensation cost related to unvested SARs	$ 29.9
Weighted-average fair value per share of awards granted (in dollars per share)	$ 37.61	$ 42.85	$ 33.56
Fair value of vested shares	$ 22.1	$ 17.7	$ 24.3
Awards issued during period (shares)	687,000
Non-employee Directors [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value per share of awards granted (in dollars per share)	$ 62.88	$ 47.30	$ 40.75
Outstanding awards (shares)	504,512
Awards issued during period (shares)	24,771	27,594	32,031
Compensation expense recognized	$ 1.6	$ 1.3	$ 1.3
Unrecognized compensation cost	$ 0.0
Non-employee Directors [Member] \| Dividend Equivalent, RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued during period (shares)	8,045	9,968	10,248
Other current liabilities [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of SARs	$ 48.0
Other long-term liabilities [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of SARs	$ 39.0

Allocated Share-based Compensation Liability

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- Definition

Share-based Goods and Non-employee Services Transaction, Compensation Cost Not Yet Recognized, Share-based Awards Other Than Options

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- Definition

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

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Unrecognized cost of unvested options awarded to employees as compensation.

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Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

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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.

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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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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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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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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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.

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