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Employee Retirement Plans (Plan Assets and Investment Strategy) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 393.8 | $ 454.8 | $ 446.4
Investments measured at net asset value | 250.8 | 293.8 |
JP Morgan Chase Bank Strategic Property Fund |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Investments measured at net asset value | 18.0 | 23.3 |
Pyramis Long Corporate A or Better |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Investments measured at net asset value | 78.6 | 73.9 |
Pyramis Long Duration |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Investments measured at net asset value | 79.2 | 73.5 |
Russell 3000 Index NL |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Investments measured at net asset value | 75.0 | 123.1 |
Level 1 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 2.7 | 2.6 |
Level 2 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 140.3 | 158.4 |
Level 3 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Cash and cash equivalents |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 2.7 | 2.6 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 2.7 | 2.6 |
Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 0.0 | $ 0.0 |
Debt securities |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Target allocation percentage of assets | 70.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Actual plan asset allocations | 70.00% | 59.00% |
Fair value of plan assets | $ 113.9 | $ 118.4 |
Debt securities | Level 1 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Debt securities | Level 2 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 113.9 | 118.4 |
Debt securities | Level 3 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 0.0 | $ 0.0 |
Equity securities |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Target allocation percentage of assets | 30.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Actual plan asset allocations | 30.00% | 41.00% |
Fair value of plan assets | $ 26.4 | $ 40.0 |
Equity securities | Level 1 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Equity securities | Level 2 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 26.4 | 40.0 |
Equity securities | Level 3 |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Pension Plan Assets, Excluding Investments Measured At NAV |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | 143.0 | 161.0 |
Investments measured at net asset value (“NAV”) (1) |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Investments measured at net asset value | $ 250.8 | $ 293.8 |
Redemption Notice Period | JP Morgan Chase Bank Strategic Property Fund |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Redemption notice period | 30 days | 45 days |
Redemption Notice Period | Pyramis Long Corporate A or Better |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Redemption notice period | 15 days | 15 days |
Redemption Notice Period | Pyramis Long Duration |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Redemption notice period | 15 days | 15 days |
Redemption Notice Period | Russell 3000 Index NL |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Redemption notice period | 1 day | 1 day |
Redemption Notice Period | Russell 1000 Index NL |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Redemption notice period |  | 1 day |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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