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Long-term Equity-based Compensation - Activity Related to Nonvested Restricted Stock (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] |  |  |
Total fair value of DSUs that vested during the years | $ 1.0 | $ 0.9 | $ 0.5
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vested in Period, Total Fair Value | 8.7 | 3.2 | 1.3
Income tax benefit from share-based compensation | $ 1.8 | $ 1.1 | $ 0.5
Performance Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) | 981,900 |  |
Time Vested Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Nonvested Balance at Beginning of Year, Restricted Shares | 130,247 |  |
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value (per share) | $ 40.34 |  |
Grants in Period | 249,422 |  |
Grants in Period, Weighted Average Grant Date Fair Value (per share) | $ 73.94 |  |
Vested in Period | (51,647) |  |
Vested in Period, Weighted Average Grant Date Fair Value (per share) | $ 49.76 |  |
Forfeited in Period | (11,781) |  |
Forfeited in Period, Weighted Average Grant Date Fair Value (per share) | $ 38.71 |  |
Nonvested Balance at End of Year, Restricted Shares | 316,241 | 130,247 |
Nonvested at End of Year, Weighted Average Grant Date Fair Value (per share) | $ 65.36 | $ 40.34 |
Performance Based Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Nonvested Balance at Beginning of Year, Restricted Shares | 225,983 |  |
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value (per share) | $ 36.90 |  |
Grants in Period | 191,292 |  |
Grants in Period, Weighted Average Grant Date Fair Value (per share) | $ 56.88 |  |
Vested in Period |  | (77,244) |
Vested in Period, Weighted Average Grant Date Fair Value (per share) |  | $ 37.63 |
Forfeited in Period | (12,731) |  |
Forfeited in Period, Weighted Average Grant Date Fair Value (per share) | $ 47.71 |  |
Nonvested Balance at End of Year, Restricted Shares | 327,300 | 225,983 |
Nonvested at End of Year, Weighted Average Grant Date Fair Value (per share) | $ 47.14 | $ 36.90 |
Performance Period, 2017 to 2019 [Member] | Performance Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Additional Shares To Be Granted If Maximum Performance Level Is Met or Exceeded | 142,413 |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) | 427,239 |  |
Performance Period, 2016 to 2018 [Member] | Performance Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Additional Shares To Be Granted If Maximum Performance Level Is Met or Exceeded | 80,999 |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) | 242,997 |  |
Performance Period, 2015 to 2017 [Member] | Performance Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Additional Shares To Be Granted If Maximum Performance Level Is Met or Exceeded | 103,888 |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) | 311,664 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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