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Nature of Operations and Significant Accounting Policies (Reclassified Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Tax impact | $ (82.9) | $ (38.6) | $ (31.3)
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total before tax | 22.2 | 17.7 | 13.6
Tax impact | 4.2 | 3.9 | 2.9
Total reclassifications for the period | 18.0 | 13.8 | 10.7
Pension Plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Prior service costs | (0.1) | (0.3) | (0.3)
Net loss | 23.4 | 19.1 | 15.3
Postretirement Benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Prior service costs | (1.1) | (1.1) | (1.1)
Net loss | $ 0.0 | $ 0.0 | $ (0.3)

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