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Employee Benefit Plans (Fair Value of Plan Assets) (Details) (Pension Benefits, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 660.7 $ 576.7 $ 520.8
Percentage of fixed income securities consisting of investment-grade corporate bonds 31.00% 39.00%  
Percentage of fixed income securities consisting of government treasuries 40.00% 27.00%  
Percentage of fixed income securities consisting of other various fixed income securities 29.00% 34.00%  
Percentage of alternative investments consisting of multi-strategy funds 5.00% 19.00%  
Percentage of alternative investments consisting of long-short equity funds 35.00% 24.00%  
Percentage of alternative investments consisting of event-driven funds 29.00% 17.00%  
Percentage of alternative investments consisting of relative value funds 12.00% 12.00%  
Percentage of alternative investments consisting of credit funds 12.00% 12.00%  
Percentage of alternative investments consisting of hedged and non-hedged funds 7.00% 16.00%  
Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 478.1 421.9  
Level 2
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 10.8 2.2  
Level 3
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 171.8 152.6 140.9
Equity Securities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 290.8 237.6  
Equity Securities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 290.8 237.6  
Global Equities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 132.0 103.7  
Global Equities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 132.0 103.7  
Non-U.S. Equities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.7 5.2  
Non-U.S. Equities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.7 5.2  
U.K. Equities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 132.0 112.2  
U.K. Equities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 132.0 112.2  
U.S. Large Cap Equities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 13.9 11.1  
U.S. Large Cap Equities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 13.9 11.1  
U.S. Small Cap Equities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.2 5.4  
U.S. Small Cap Equities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.2 5.4  
Fixed Income Securities
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 187.3 [1] 184.3 [2]  
Fixed Income Securities | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 187.3 [1] 184.3 [2]  
Aggregate Fixed Income
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.5 7.6  
Aggregate Fixed Income | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 6.5 7.6  
International
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 180.8 176.7  
International | Level 1
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 180.8 176.7  
Cash and Cash Equivalents
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 10.8 2.2  
Cash and Cash Equivalents | Level 2
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 10.8 2.2  
Cash
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 10.8 2.2  
Cash | Level 2
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 10.8 2.2  
Alternative Investments
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 146.0 [2] 127.1 [3]  
Alternative Investments | Level 3
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 146.0 [2] 127.1 [3] 119.8
Miscellaneous Funds
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 25.8 [4] 25.5 [5]  
Miscellaneous Funds | Level 3
      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 25.8 [4] $ 25.5 [5] $ 21.1
[1] 40% of “fixed income” securities are in government treasuries; 31% are in investment-grade corporate bonds; and 29% are in other various fixed income securities.
[2] 35% of “alternative investments” are in long-short equity funds; 29% are in event-driven funds; 12% are in relative value funds; 12% are in credit funds; 7% are distributed in hedged and non-hedged funds; and 5% are in multi-strategy funds.
[3] 24% of “alternative investments” are in long-short equity funds; 19% are in multi-strategy funds; 17% are in event-driven funds; 16% are distributed in hedged and non-hedged funds; 12% are in relative value funds; and 12% are in credit funds.
[4] “Miscellaneous funds” is comprised of pooled funds in Australia and insurance contracts in Finland, Norway and Switzerland.
[5] “Miscellaneous funds” is comprised of pooled funds in Australia and various contracts in Finland, Norway and Switzerland