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Employee Benefit Plans (Textuals) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of medical coverage cost payable by participants | 100.00% |  |
Amendments |  | $ 3.2 |
Decrease in projected benefit obligation |  | 50.6 |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amendments | $ 0.0 | $ 0.1 |
Estimated prior service (cost) credits | 0.1 |  |
Estimated actuarial gains (losses) | $ 9.3 |  |
Long-term rate of return on assets assumption (as a percent) | 7.50% | 7.50% | 7.50%
Discount rate (as a percent) | 3.66% | 4.17% |
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amendments | $ 0.0 | $ 0.0 |
Estimated prior service (cost) credits | (1.4) |  |
Estimated actuarial gains (losses) | $ 1.3 |  |
Long-term rate of return on assets assumption (as a percent) | 0.00% | 0.00% | 0.00%
Discount rate (as a percent) | 3.25% | 3.50% |
Fixed Income, Money Market, Cash and Guaranteed Investment Contracts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target (as a percent) | 75.00% |  |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target (as a percent) | 25.00% |  |
International Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target (as a percent) | 12.50% |  |
U.S. Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target (as a percent) | 12.50% |  |
UNITED KINGDOM |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Components of fair value in our plan assets | 7.00% |  |
Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation (as a percent) | 88.00% |  |
Plan assets (as a percent) | 87.00% |  |
Long-term rate of return on assets assumption (as a percent) | 7.50% |  |
Components of fair value in our plan assets | 87.00% |  |
Canada [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Components of fair value in our plan assets | 6.00% |  |

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- Definition Percentage of Fair Value of Plan Assets Held. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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