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Employee Benefit Plans (Amounts Recognized in AOCI and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes recognized in other comprehensive income (loss): |  |  |
Total recognized in other comprehensive income | $ (7.3) | $ (6.3) | $ (9.7)
Pension Benefits [Member] |  |  |
Amounts recognized in other comprehensive income (loss): |  |  |
Prior service costs | (0.8) | (0.9) |
Actuarial loss | (194.6) | (197.3) |
Subtotal | (195.4) | (198.2) |
Deferred taxes | 71.2 | 71.0 |
Net amount recognized | (124.2) | (127.2) |
Changes recognized in other comprehensive income (loss): |  |  |
Current year prior service costs | 0.1 | 0.1 |
Current year actuarial loss | 3.7 | 23.3 |
Effect of exchange rates | 1.7 | (1.5) |
Amortization of prior service (costs) credits | (0.2) | (0.3) |
Amortization of actuarial loss | (8.8) | (39.2) |
Total recognized in other comprehensive income | (3.5) | (17.6) |
Total recognized in net periodic benefit cost and other comprehensive income (loss) | 1.8 | 20.1 |
Estimated prior service (cost) credits | (0.1) |  |
Estimated actuarial gains (losses) | (9.3) |  |
Other Benefits [Member] |  |  |
Amounts recognized in other comprehensive income (loss): |  |  |
Prior service costs | 9.5 | 12.0 |
Actuarial loss | (14.7) | (16.3) |
Subtotal | (5.2) | (4.3) |
Deferred taxes | 1.9 | 1.6 |
Net amount recognized | (3.3) | (2.7) |
Changes recognized in other comprehensive income (loss): |  |  |
Current year prior service costs | 0.0 | 0.0 |
Current year actuarial loss | (0.1) | (0.7) |
Effect of exchange rates | 0.0 | 0.0 |
Amortization of prior service (costs) credits | 2.4 | 3.1 |
Amortization of actuarial loss | (1.4) | (1.4) |
Total recognized in other comprehensive income | 0.9 | 1.0 |
Total recognized in net periodic benefit cost and other comprehensive income (loss) | 0.0 | $ (0.5) |
Estimated prior service (cost) credits | 1.4 |  |
Estimated actuarial gains (losses) | $ (1.3) |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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