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Employee Benefits Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 69.6 | $ 69.1 |
Deferred Compensation Plan Assets | 8.2 | 7.3 |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 42.2 | 39.6 |
Deferred Compensation Plan Assets | 8.2 | 7.3 |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 16.1 | 16.6 |
Deferred Compensation Plan Assets | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 26.1 | 23.0 |
Deferred Compensation Plan Assets | 8.2 | 7.3 |
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Deferred Compensation Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 34.0 | 32.3 |
Salaried VEBA | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 16.1 | 16.6 |
Salaried VEBA | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17.9 | 15.7 |
Salaried VEBA | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Diversified Investment Funds in Registered Investment Companies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12.8 | 14.7 |
Salaried VEBA | Diversified Investment Funds in Registered Investment Companies [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12.8 | 14.7 |
Salaried VEBA | Diversified Investment Funds in Registered Investment Companies [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Diversified Investment Funds in Registered Investment Companies [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 21.3 | 23.8 |
Salaried VEBA | Fixed Income Funds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17.9 | 15.7 |
Salaried VEBA | Fixed Income Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Fixed Income Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 17.9 | 15.7 |
Salaried VEBA | Fixed Income Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.3 | 1.9 |
Salaried VEBA | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.3 | 1.9 |
Salaried VEBA | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Salaried VEBA | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.0 | 0.0 |
Canadian pension plan |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 6.1 | 5.7 | $ 6.3
Canadian pension plan | Diversified Investment Funds in Registered Investment Companies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 6.1 | $ 5.7 |

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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