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Employee Benefit Plans (Assets Measured at NAV) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Assets Category: |  |
Fair Value | $ 318.6 | $ 292.5
NAV [Member] |  |
Assets Category: |  |
Fair Value | $ 314.7 | 287.2
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 | $ 69.5
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 | $ 47.6
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 | $ 197.9 | $ 134.9
Redemption Frequency (if currently eligible) | Daily | Daily
Balanced pension trusts [Member] | International Equity [Member] |  |
Assets Category: |  |
Fair Value | $ 4.6 | $ 4.7
Redemption Frequency (if currently eligible) | Daily | Daily
Balanced pension trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | $ 13.6 | $ 11.9
Redemption Frequency (if currently eligible) | Daily | Daily
Pension Funds [Member] | International Equity [Member] |  |
Assets Category: |  |
Fair Value | $ 3.3 | $ 13.5
Redemption Frequency (if currently eligible) | Daily | Daily
Pension Funds [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | $ 5.9 | $ 5.1
Redemption Frequency (if currently eligible) | Daily | Daily
Pension Fund Member | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | $ 5.9 | $ 5.1
Pension Fund Member | Blend [Domain] |  |
Assets Category: |  |
Fair Value | $ 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 | $ 314.7 | $ 287.2
Fair Value, Inputs, Level 2 [Member] | Commingled Pools / Collective Trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | 197.9 | 134.9
Fair Value, Inputs, Level 2 [Member] | Balanced pension trusts [Member] | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | 13.6 | 11.9
Fair Value, Inputs, Level 2 [Member] | Pension Fund Member | Fixed Income [Member] |  |
Assets Category: |  |
Fair Value | 5.9 | $ 5.1
Fair Value, Inputs, Level 2 [Member] | Pension Fund Member | Blend [Domain] |  |
Assets Category: |  |
Fair Value | $ 12.5 |
Redemption Frequency (if currently eligible) | Daily |

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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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