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Retirement and Other Postretirement Benefit Plans - Schedule of Pension Assets Measured at Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | $ 201.8 | $ 171.4 |
Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 56.3 | 53.8 |
Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 48.0 | 41.2 |
Liability Driven Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 38.7 | 34.4 |
Other Insurance Product Line |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 4.2 | 3.6 |
Index Linked Gilts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 52.1 | 36.1 |
Diversified Investment, Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.3 | 2.1 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 0.2 | 0.2 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 0.2 | 0.2 |
Level 1 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 0.2 | 0.2 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 195.1 | 165.5 |
Level 2 | Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 56.3 | 53.8 |
Level 2 | Diversified Growth Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 48.0 | 41.2 |
Level 2 | Liability Driven Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 38.7 | 34.4 |
Level 2 | Index Linked Gilts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 52.1 | 36.1 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 6.5 | 5.7 | $ 5.6
Actual return on plan assets | 0.3 | 0.3 |
Purchases, sales and settlements | (0.3) |  |
Changes due to exchange rates | 0.8 | (0.2) |
Level 3 | Other Insurance Product Line |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 4.2 | 3.6 | 3.5
Actual return on plan assets | 0.2 | 0.2 |
Purchases, sales and settlements | (0.1) |  |
Changes due to exchange rates | 0.5 | (0.1) |
Level 3 | Diversified Investment, Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value measurements | 2.3 | 2.1 | $ 2.1
Actual return on plan assets | 0.1 | 0.1 |
Purchases, sales and settlements | (0.2) |  |
Changes due to exchange rates | $ 0.3 | $ (0.1) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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. + 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 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements. + 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 (d)(5)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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