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Employee Benefit Plans (Assets Measured at NAV) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Assets Category: |  |
Fair Value | $ 291.0 | $ 318.6
NAV [Member] |  |
Assets Category: |  |
Fair Value | $ 283.8 | 314.7
Fixed Income [Member] | United Kingdom Pension Plans [Member] |  |
Assets Category: |  |
Weighted average maturity period | 5 years |
Commingled Pools / Collective Trusts [Member] | U.S. Equity [Member] |  |
Assets Category: |  |
Fair Value |  | $ 34.7
Redemption Frequency (if currently eligible) | Daily | Daily
Redemption Notice Period | 5 days | 5 days
Commingled Pools / Collective Trusts [Member] | International Equity [Member] |  |
Assets Category: |  |
Fair Value |  | $ 42.2
Redemption Frequency (if currently eligible) | Daily | Daily
Redemption Notice Period | 5 days | 5 days
Commingled Pools / Collective Trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | $ 146.2 | $ 197.9
Redemption Frequency (if currently eligible) | Daily | Daily
Balanced pension trusts [Member] | International Equity [Member] |  |
Assets Category: |  |
Fair Value |  | $ 4.6
Redemption Frequency (if currently eligible) | Daily | Daily
Balanced pension trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | $ 12.0 | $ 13.6
Redemption Frequency (if currently eligible) | Daily | Daily
Pension Funds [Member] | International Equity [Member] |  |
Assets Category: |  |
Fair Value |  | $ 3.3
Redemption Frequency (if currently eligible) | Daily | Daily
Pension Funds [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value |  | $ 5.9
Redemption Frequency (if currently eligible) | Daily | Daily
Pension Fund Member | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | $ 8.9 | $ 5.9
Pension Fund Member | Blend [Domain] |  |
Assets Category: |  |
Fair Value | $ 7.8 | $ 12.5
Minimum [Member] | Commingled Pools / Collective Trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Redemption Notice Period | 5 years | 5 years
Minimum [Member] | Balanced pension trusts [Member] | International Equity [Member] |  |
Assets Category: |  |
Redemption Notice Period | 3 days | 3 days
Minimum [Member] | Balanced pension trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Redemption Notice Period | 3 days | 3 days
Minimum [Member] | Pension Funds [Member] | International Equity [Member] |  |
Assets Category: |  |
Redemption Notice Period | 1 day | 1 day
Minimum [Member] | Pension Funds [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Redemption Notice Period | 1 day | 1 day
Maximum [Member] | Commingled Pools / Collective Trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Redemption Notice Period | 15 days | 15 days
Maximum [Member] | Balanced pension trusts [Member] | International Equity [Member] |  |
Assets Category: |  |
Redemption Notice Period | 5 years | 5 years
Maximum [Member] | Balanced pension trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Redemption Notice Period | 5 years | 5 years
Maximum [Member] | Pension Funds [Member] | International Equity [Member] |  |
Assets Category: |  |
Redemption Notice Period | 7 days | 7 days
Maximum [Member] | Pension Funds [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Redemption Notice Period | 7 days | 7 days
Fair Value, Inputs, Level 2 [Member] |  |
Assets Category: |  |
Fair Value | $ 283.8 | $ 314.7
Fair Value, Inputs, Level 2 [Member] | Commingled Pools / Collective Trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | 146.2 | 197.9
Fair Value, Inputs, Level 2 [Member] | Balanced pension trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | 12.0 | 13.6
Fair Value, Inputs, Level 2 [Member] | Pension Fund Member | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | 8.9 | 5.9
Fair Value, Inputs, Level 2 [Member] | Pension Fund Member | Blend [Domain] |  |
Assets Category: |  |
Fair Value | $ 7.8 | $ 12.5
Redemption Frequency (if currently eligible) | Daily | Daily

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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