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Consolidated Statement of Comprehensive Income Parentheticals - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Unrealized Gain (Loss) on Securities, Income Tax Expense (Benefit) | $ 0.0 | $ 0.7 | $ (0.2)
Defined Benefit Pension and Other Postretirement Benefit Plans, Income Tax Expense (Benefit) | $ 0.3 | $ 2.2 | $ (2.4)

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