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Postretirement Benefits Other than Pensions - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unrecognized actuarial losses | $ 3.1 |  |
Unrecognized actuarial losses, net of tax | 1.7 |  |
Unrecognized prior service credit | 11.1 |  |
Unrecognized prior service credit, net of tax | 6.1 |  |
Postretirement Health Coverage [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net gain (loss) recognized in other comprehensive income | 0.1 | $ (0.3) |
Amortization of net loss | 0.3 | 0.2 | $ 0.2
Amortization of prior service credit recognized in other comprehensive income | $ 1.3 | 1.3 | $ 1.3
Unrecognized actuarial losses |  | 3.5 |
Unrecognized actuarial losses, net of tax |  | 1.9 |
Unrecognized prior service credit |  | 12.4 |
Unrecognized prior service credit, net of tax |  | $ 6.9 |

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- Definition Amortization of net loss recognized in other comprehensive income before tax. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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