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Employee Benefit Plans - Schedule of fair values of defined benefit plan's assets (Detail) - Defined Benefit Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | $ 438.6 | $ 416.4 | $ 410.1
Partnerships [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 35.3 | 32.7 |
Derivative [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 14.8 | 19.0 |
US Government Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 88.1 | 88.9 |
Corporate Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 18.3 | 25.5 |
Domestic Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 144.4 | 66.7 |
Foreign Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 57.5 | 86.0 |
Foreign Bond [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 41.8 | 33.3 |
Hedge Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 1.6 | 30.3 |
Short-term Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 36.8 | 34.0 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 36.8 | 34.0 |
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 36.8 | 34.0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 401.8 | 382.4 |
Fair Value, Inputs, Level 2 [Member] | Partnerships [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 35.3 | 32.7 |
Fair Value, Inputs, Level 2 [Member] | Derivative [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 14.8 | 19.0 |
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 88.1 | 88.9 |
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 18.3 | 25.5 |
Fair Value, Inputs, Level 2 [Member] | Domestic Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 144.4 | 66.7 |
Fair Value, Inputs, Level 2 [Member] | Foreign Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 57.5 | 86.0 |
Fair Value, Inputs, Level 2 [Member] | Foreign Bond [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | 41.8 | 33.3 |
Fair Value, Inputs, Level 2 [Member] | Hedge Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of defined benefit plan assets | $ 1.6 | $ 30.3 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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