Retirement Plans (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributory defined benefit pension plans \| plan	4
Net periodic pension cost [Abstract]
Employer service cost - benefits earned during the period	$ 2.0	$ 4.7	$ 3.7
Interest cost on projected benefit obligation	12.3	14.5	16.1
Expected return on plan assets	(19.5)	(20.9)	(24.5)
Net amortization of deferrals	(0.7)	(4.3)	(1.0)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0.0	(0.4)	0.0
Recognized actuarial loss	0.2	0.2	0.2
Net periodic pension cost (benefit)	(4.3)	2.4	(3.5)
Change in benefit obligation:
Service cost	2.0	4.7	3.7
Interest cost	12.3	14.5	16.1
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Accumulated other comprehensive income yet to be recognized as components of net periodic pension cost, prior service cost	0.6	0.6
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	44.2	(25.2)	57.4
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	(0.9)	(4.1)	(1.2)
other comprehensive income loss pension plans adjustment, foreign currency exchange rate changes	(11.7)	(3.5)	(2.4)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	31.6	(32.8)	53.8
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	11.2	30.5
Net periodic pension cost [Abstract]
Employer service cost - benefits earned during the period	2.0	4.7
Interest cost on projected benefit obligation	12.3	14.5
Change in benefit obligation:
Projected benefit obligations, benefit obligation, beginning of year	358.5	427.2
Service cost	2.0	4.7
Interest cost	12.3	14.5
Defined Benefit Plan, Curtailments	0.0	(3.6)
Plan participants' contributions	0.1	0.4
Benefits paid	(16.2)	(10.1)
Actuarial loss (gain)	80.7	(49.6)
Changes in currency translation rates	(62.1)	(23.0)
Other	(1.4)	(2.0)
Projected benefit obligations, benefit obligation, end of year	373.9	358.5	427.2
Change in plan assets:
Funded status and net amount recognized	(9.0)	26.4
Accumulated benefit obligation, December 31,	373.9	357.3
Fair value of plan assets, benefit obligation, beginning of year	384.9	414.3
Actual return on plan assets	52.6	16.3
Plan contributions	8.4	12.2
Benefits paid	(16.2)	(10.1)
Changes in currency translation rates	(63.4)	(23.4)
Other	(1.4)	(24.4)
Fair value of plan assets, benefit obligation, end of year	364.9	384.9	414.3
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension assets - included in Other long-term assets	(20.2)	(4.1)
Accumulated other comprehensive loss	(91.2)	(59.6)
Accumulated other comprehensive income yet to be recognized as components of net periodic pension cost, actuarial losses	90.8	59.0
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	$ 28.5	$ 62.7
Defined benefit plan, equity securities, U.K. equities	8.00%	16.00%
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	$ 103.5	$ 127.2
Defined benefit plan, equity securities, non U.K. equities	28.00%	33.00%
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	$ 154.1	$ 123.4
Defined benefit plan, debt securities, corporate bonds	42.00%	32.00%
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	$ 17.5	$ 19.0
Defined benefit plan, debt securities, government and other	5.00%	5.00%
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	$ 18.7	$ 19.5
Defined Benefit Plan, Cash and Cash Equivalents	5.00%	5.00%
Defined Benefit Plan, Debt Securities, Other, Amount	$ 42.6	$ 33.1
Defined Benefit Plan, Other	12.00%	9.00%
Defined benefit plan, actual plan asset allocations	100.00%	100.00%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined benefit plan, estimated future employer contributions in next fiscal year	$ 7.6
2017	15.0
2018	15.4
2019	15.9
2020	16.3
2021	16.8
2022 to 2026	91.4
Total	170.8
United States Retirement Plans of US Entity, Defined Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	23.4	$ 19.3	17.1
Foreign Retirement Plans, Defined Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 27.2	$ 29.0	$ 27.4
Minimum [Member] \| Foreign Pension Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in determining present values	2.00%	2.25%	4.00%
Annual increase in future compensation levels	0.00%	0.00%	0.00%
Expected long-term rate of return on assets	2.00%	2.70%	4.10%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.00%	2.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	0.00%	0.00%
Maximum [Member] \| Foreign Pension Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in determining present values	3.90%	3.70%	4.65%
Annual increase in future compensation levels	3.50%	3.50%	3.85%
Expected long-term rate of return on assets	5.90%	5.80%	7.00%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.70%	3.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.65%	3.50%
Fair Value, Inputs, Level 1 [Member] \| Foreign Pension Plan [Member]
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	$ 255.5
Fair value of plan assets, benefit obligation, end of year	261.3	$ 255.5
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	26.0	46.9
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	89.0	104.7
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	121.3	91.7
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	14.8	7.4
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	6.6	3.6
Defined Benefit Plan, Debt Securities, Other, Amount	3.6	1.2
Fair Value, Inputs, Level 2 [Member] \| Foreign Pension Plan [Member]
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	106.9
Fair value of plan assets, benefit obligation, end of year	74.4	106.9
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	2.5	15.8
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	14.5	22.5
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	32.8	31.7
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	2.7	11.6
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	12.1	15.9
Defined Benefit Plan, Debt Securities, Other, Amount	9.8	9.4
Fair Value, Inputs, Level 3 [Member] \| Foreign Pension Plan [Member]
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	22.5
Fair value of plan assets, benefit obligation, end of year	29.2	22.5
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	0.0	0.0
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	0.0	0.0
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	0.0	0.0
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	0.0	0.0
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	0.0	0.0
Defined Benefit Plan, Debt Securities, Other, Amount	$ 29.2	$ 22.5

Defined Benefit Plan, Cash and Cash Equivalents

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- Definition

The percentage of the fair value of corporate bond debt securities to the fair value of total plan assets held as of the measurement date.

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No definition available.

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Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount

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Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount

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Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount

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Defined Benefit Plan, Debt Securities, Other, Amount

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Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount

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The percentage of the fair value of non U.K. equity securities to the fair value of total plan assets held as of the measurement date.

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No definition available.

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Defined Benefit Plan, Equity Securities U.K. Equities, Amount

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The percentage of the fair value of U.K. equity securities to the fair value of total plan assets held as of the measurement date.

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No definition available.

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Defined Benefit Plan, Expected Future Benefit Payments

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- Definition

The percentage of the fair value of government and other debt securities to the fair value of total plan assets held as of the measurement date.

+ References

No definition available.

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Defined Benefit Plan, Other

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- Definition

Other increase (decrease) during the period in the benefit obligation, not separately disclosed.

+ References

No definition available.

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- Definition

Other increase (decrease) during the period in plan assets, not separately disclosed.

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No definition available.

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- Definition

The increase in the fair value of plan assets from contributions made by the employer and plan participants.

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No definition available.

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- Definition

Represents the number of contributory defined benefit pension plans the entity provides to eligible employees.

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No definition available.

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- Definition

other comprehensive income loss pension plans adjustment, foreign currency exchange rate changes

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No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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- Definition

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i)
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- Definition

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Prior Service Cost
-URI http://asc.fasb.org/extlink&oid=49177896

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)
-URI http://asc.fasb.org/extlink&oid=6504192

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 715
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-Subparagraph (b)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6504226

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Gain or Loss
-URI http://asc.fasb.org/extlink&oid=49168827

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The amount of gains or losses recognized in net periodic benefit cost.

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No definition available.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Subparagraph (c)
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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
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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.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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