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Pension Plans - Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |
Net actuarial gain | $ 1.4 | $ 1.6
Amortization of net gain | 2.7 | 2.8
Prior service cost | (2.2) | 0.0
Amortization of prior service credit | (0.5) | (0.5)
Total recognized in other comprehensive income | 1.4 | 3.9
Total credit recognized in net periodic benefit cost and other comprehensive income | 5.4 | 7.3
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Net actuarial loss | (136.4) | (140.5)
Net prior service credit | 12.7 | 15.5
Total included in AOCI not yet recognized in the statement of income | $ (123.7) | $ (125.0)

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