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Employee Benefit Plans (Fair Value Pension Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets |  | $ 711.0 |
Percentage of Fixed Income Securities Consisting of Asset-Backed and Mortgage-Backed Securities | 6.00% |  |
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | $ 808.6 | $ 711.0 | $ 617.1
Percentage of Fixed Income Securities Consisting of Investment-grade Corporate Bonds | 44.00% | 43.00% |
Percentage of Fixed Income Securities Consisting of Government Treasuries | 20.00% | 18.00% |
Percentage of fixed income securities consisting of high-yield securities | 11.00% | 14.00% |
Percentage of Fixed Income Securities Consisting of Foreign Securities | 10.00% | 10.00% |
Percentage of Fixed Income Securities Consisting of Asset-Backed and Mortgage-Backed Securities |  | 9.00% |
Percentage of Fixed Income Securities Consisting of Other Various Fixed Income Securities | 9.00% | 6.00% |
Percentage of Alternative Investments Consisting of Relative Value Funds | 42.00% | 42.00% |
Percentage of Alternative Investments Consisting of Long-short Equity Funds | 25.00% | 24.00% |
Percentage of Alternative Investments Consisting of Event-driven Funds | 14.00% | 21.00% |
Percentage of Alternative Investments Consisting of Credit Funds | 14.00% | 6.00% |
Percentage of Alternative Investments Consisting of Hedged and Non-hedged Funds | 5.00% | 7.00% |
Pension Benefits | Equity Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | $ 314.3 | $ 261.7 |
Pension Benefits | Global Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 235.3 | 183.4 |
Pension Benefits | Non-U.S. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 4.7 | 3.8 |
Pension Benefits | U.K. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 65.2 | 65.2 |
Pension Benefits | U.S. Large Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 5.2 | 5.9 |
Pension Benefits | U.S. Small Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 3.9 | 3.4 |
Pension Benefits | Fixed Income Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 412.4 | 370.1 |
Pension Benefits | Aggregate Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 162.9 | 150.1 |
Pension Benefits | International Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 249.5 | 220.0 |
Pension Benefits | Alternative Investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 40.6 | 35.6 |
Pension Benefits | Private Equity Funds [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 2.1 | 2.3 |
Pension Benefits | Cash and Cash Equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 38.5 | 33.3 |
Pension Benefits | Miscellaneous Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 36.6 | 30.8 |
Pension Benefits | Cash and cash equivalents measured at net asset value [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 4.7 | 12.8 |
Fair Value, Inputs, Level 1, 2 and 3 | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 808.6 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets |  | 564.9 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 647.9 |  |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Equity Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 235.5 | 194.8 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Global Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 156.5 | 116.5 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Non-U.S. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 4.7 | 3.8 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | U.K. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 65.2 | 65.2 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | U.S. Large Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 5.2 | 5.9 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | U.S. Small Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 3.9 | 3.4 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Fixed Income Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 412.4 | 370.1 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Aggregate Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 162.9 | 150.1 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | International Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 249.5 | 220.0 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Alternative Investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Private Equity Funds [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Cash and Cash Equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Miscellaneous Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Pension Benefits | Cash [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets |  | 66.9 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 78.8 |  |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Equity Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 78.8 | 66.9 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Global Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 78.8 | 66.9 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Non-U.S. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | U.K. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | U.S. Large Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | U.S. Small Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Fixed Income Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Aggregate Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | International Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Alternative Investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Private Equity Funds [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Cash and Cash Equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Miscellaneous Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Pension Benefits | Cash [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets |  | 33.1 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 38.7 | 33.1 | 30.5
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Equity Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Global Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Non-U.S. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | U.K. Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | U.S. Large Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | U.S. Small Cap Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Fixed Income Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Aggregate Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | International Fixed Income Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Alternative Investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 2.1 | 2.3 | 2.3
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Private Equity Funds [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 2.1 | 2.3 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Cash and Cash Equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 0.0 | 0.0 |
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Miscellaneous Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | 36.6 | 30.8 | $ 28.2
Fair Value, Inputs, Level 3 [Member] | Pension Benefits | Cash [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total assets | $ 0.0 | $ 0.0 |

X
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