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

No definition available.

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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

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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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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

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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

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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

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