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Operations and Summary of Significant Accounting Policies - Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | $ 81.2 | $ 20.2 | $ (555.8)
AOCI Attributable To Parent |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax | 84.9 | 5.8 | (554.3)
Other comprehensive income (loss), income taxes | (4.9) | 12.8 | 0.6
Other comprehensive income (loss), net of reclassification adjustments | 80.0 | 18.6 | (553.7)
Defined Benefit Pension Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax | 24.2 | (68.2) | 4.9
Other comprehensive income (loss), income taxes | (4.8) | 12.7 | (0.6)
Other comprehensive income (loss), net of reclassification adjustments | 19.4 | (55.5) | 4.3
Net loss on derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax | 4.1 | (6.8) | (3.1)
Other comprehensive income (loss), income taxes | (0.1) | 0.1 | 1.2
Other comprehensive income (loss), net of reclassification adjustments | 4.0 | (6.7) | (1.9)
Foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax | 56.6 | 80.8 | (556.1)
Other comprehensive income (loss), income taxes | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of reclassification adjustments | 56.6 | 80.8 | (556.1)
AOCI Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | 1.2 | 1.6 | (2.1)
Defined benefit pension plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | 0.0 | 0.0 | 0.0
Net loss on derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | 0.0 | 0.0 | 0.0
Foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | $ 1.2 | $ 1.6 | $ (2.1)

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