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Pension and Non-pension Post-employment Benefit Plans - Market Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Employee Benefits [Abstract]
Debt investment funds	$ 225.2	$ 283.1
Equity investment funds	7.0	60.4
Other investment funds / insurance annuities	148.5	25.6
Other	14.8	8.1
Total	$ 395.5	$ 377.2
Debt investment funds, allocation percentage	57.00%	75.00%
Equity investment funds, allocation percentage	2.00%	16.00%
Other investment funds / insurance annuities, allocation percentage	37.00%	7.00%
Other, allocation percentage	4.00%	2.00%
Total, allocation percentage	100.00%	100.00%

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- Definition

Debt Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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Employee Benefits [Abstract]

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Other Assets, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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- Definition

The amount that instruments representing debt (rather than equity) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount that other types of assets not separately disclosed constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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