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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Detail) - Pension - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	$ 438.2	$ 412.6	$ 522.1
United States | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value, excluding alternative investments	387.9	359.5
Alternative investments	50.3	53.1
Assets at fair value	438.2	412.6
United States | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	149.6	137.7
United States | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	80.5	77.5
United States | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	101.6	86.5
United States | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	24.8	18.1
United States | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	23.5	29.9
United States | Fair value, measurements, recurring | Preferred stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	1.5	1.4
United States | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	6.4	8.4
United States | Level 1 | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	308.7	277.1
United States | Level 1 | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	149.6	137.7
United States | Level 1 | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	54.9	51.1
United States | Level 1 | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	101.6	86.5
United States | Level 1 | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 1 | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 1 | Fair value, measurements, recurring | Preferred stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	1.0	0.9
United States | Level 1 | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	1.6	0.9
United States | Level 2 | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	79.2	82.4
United States | Level 2 | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 2 | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	25.6	26.4
United States | Level 2 | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 2 | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	24.8	18.1
United States | Level 2 | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	23.5	29.9
United States | Level 2 | Fair value, measurements, recurring | Preferred stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.5	0.5
United States | Level 2 | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	4.8	7.5
United States | Level 3 | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Preferred stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
United States | Level 3 | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	406.4	367.1	$ 368.2
Foreign | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value, excluding alternative investments	370.6	333.9
Alternative investments	35.8	33.2
Assets at fair value	406.4	367.1
Foreign | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	163.3	132.6
Foreign | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	71.6	73.2
Foreign | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	30.9	31.2
Foreign | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	37.0	37.1
Foreign | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	58.8	53.8
Foreign | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	9.0	6.0
Foreign | Level 1 | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	75.0	76.4
Foreign | Level 1 | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 1 | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	71.6	73.2
Foreign | Level 1 | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 1 | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 1 | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 1 | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	3.4	3.2
Foreign | Level 2 | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	295.6	257.5
Foreign | Level 2 | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	163.3	132.6
Foreign | Level 2 | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 2 | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	30.9	31.2
Foreign | Level 2 | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	37.0	37.1
Foreign | Level 2 | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	58.8	53.8
Foreign | Level 2 | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	5.6	2.8
Foreign | Level 3 | Fair value, measurements, recurring
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 3 | Fair value, measurements, recurring | Mutual funds/Equity funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 3 | Fair value, measurements, recurring | Common stock
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 3 | Fair value, measurements, recurring | Mutual funds/Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 3 | Fair value, measurements, recurring | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 3 | Fair value, measurements, recurring | Government obligations
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	0.0	0.0
Foreign | Level 3 | Fair value, measurements, recurring | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Assets at fair value	$ 0.0	$ 0.0

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- Definition

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- Definition

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+ 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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