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Employee Benefit Plans (Reconciliation of Level 3 Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | $ 601.7 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Fair value of plan assets at end of year |  | $ 601.7
Pension Benefits |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 601.7 | 630.7
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Foreign currency exchange rate changes | 54.7 | (97.9)
Fair value of plan assets at end of year | 691.8 | 601.7
Pension Benefits | Alternative Investments |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 36.8 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Fair value of plan assets at end of year | 37.2 | 36.8
Pension Benefits | Miscellaneous Funds |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 21.4 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Fair value of plan assets at end of year | 25.4 | 21.4
Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 23.8 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Fair value of plan assets at end of year |  | 23.8
Level 3 | Pension Benefits |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 23.8 | 24.1
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Related to assets still held at reporting | (2.3) | 1.0
Relating to assets sold during period | 0.0 | 0.0
Purchases, sales and /or settlements | 3.4 | (0.8)
Foreign currency exchange rate changes | 2.9 | (0.5)
Fair value of plan assets at end of year | 27.8 | 23.8
Level 3 | Pension Benefits | Alternative Investments |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 2.4 | 2.4
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Related to assets still held at reporting | (0.1) | 0.0
Relating to assets sold during period | 0.0 | 0.0
Purchases, sales and /or settlements | 0.1 | 0.0
Foreign currency exchange rate changes | 0.0 | 0.0
Fair value of plan assets at end of year | 2.4 | 2.4
Level 3 | Pension Benefits | Miscellaneous Funds |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 21.4 | 21.7
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) [Abstract] |  |
Related to assets still held at reporting | (2.2) | 1.0
Relating to assets sold during period | 0.0 | 0.0
Purchases, sales and /or settlements | 3.3 | (0.8)
Foreign currency exchange rate changes | 2.9 | (0.5)
Fair value of plan assets at end of year | $ 25.4 | $ 21.4

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 Amount of foreign currency translation gain (loss) which increases (decreases) plan assets 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements. + 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)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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