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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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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
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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
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-SubTopic 20
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 820
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Net asset value of investment in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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