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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 630.7 $ 677.2 $ 660.7
Percentage of fixed income securities consisting of investment-grade corporate bonds 45.00% 37.00%  
Percentage of fixed income securities consisting of government treasuries 32.00% 39.00%  
Percentage of fixed income securities consisting of other various fixed income securities 23.00% 24.00%  
Percentage of alternative investments consisting of long-short equity funds 34.00% 34.00%  
Percentage of alternative investments consisting of event-driven funds 26.00% 31.00%  
Percentage of alternative investments consisting of relative value funds 13.00% 12.00%  
Percentage of alternative investments consisting of credit funds 13.00% 10.00%  
Percentage of alternative investments consisting of hedged and non-hedged funds 12.00% 9.00%  
Percentage of alternative investments consisting of multi-strategy funds 2.00% 4.00%  
Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 490.0 $ 522.6  
Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.4 7.5  
Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 133.3 147.1 171.8
Equity Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 268.4 274.6  
Equity Securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 268.4 274.6  
Equity Securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Equity Securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Global Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 129.0 135.9  
Global Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 129.0 135.9  
Global Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Global Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Non-U.S. Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.9 4.3  
Non-U.S. Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.9 4.3  
Non-U.S. Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Non-U.S. Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
U.K. Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 124.8 122.8  
U.K. Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 124.8 122.8  
U.K. Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
U.K. Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
U.S. Large Cap Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.1 7.1  
U.S. Large Cap Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.1 7.1  
U.S. Large Cap Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
U.S. Large Cap Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
U.S. Small Cap Equities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.6 4.5  
U.S. Small Cap Equities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 3.6 4.5  
U.S. Small Cap Equities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
U.S. Small Cap Equities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 221.6 [1] 248.0 [2]  
Fixed Income Securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 221.6 [1] 248.0 [2]  
Fixed Income Securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 [1] 0.0 [2]  
Fixed Income Securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 [1] 0.0 [2]  
Aggregate Fixed Income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 16.8 17.5  
Aggregate Fixed Income | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 16.8 17.5  
Aggregate Fixed Income | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Aggregate Fixed Income | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
International Fixed Income      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 204.8 230.5  
International Fixed Income | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 204.8 230.5  
International Fixed Income | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
International Fixed Income | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.4 7.5  
Cash and Cash Equivalents | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Cash and Cash Equivalents | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.4 7.5  
Cash and Cash Equivalents | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Cash      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.4 7.5  
Cash | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Cash | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 7.4 7.5  
Cash | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 0.0  
Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 111.6 [2] 124.3 [3]  
Alternative Investments | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 [2] 0.0 [3]  
Alternative Investments | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 [2] 0.0 [3]  
Alternative Investments | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 111.6 [2] 124.3 [3] 146.0
Miscellaneous Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 21.7 [4] 22.8 [5]  
Miscellaneous Funds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 [4] 0.0 [5]  
Miscellaneous Funds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets 0.0 [4] 0.0 [5]  
Miscellaneous Funds | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total assets $ 21.7 [4] $ 22.8 [5] $ 25.8
[1] 45% of “fixed income” securities are in investment-grade corporate bonds; 32% are in government treasuries; and 23% are in other various fixed income securities.
[2] 34% of “alternative investments” are in long-short equity funds; 26% are in event-driven funds; 13% are in relative value funds; 13% are in credit funds; 12% are distributed in hedged and non-hedged funds; and 2% are in multi-strategy funds.
[3] 34% of “alternative investments” are in long-short equity funds; 31% are in event-driven funds; 12% are in relative value funds; 10% are in credit funds; 9% are distributed in hedged and non-hedged funds; and 4% are in multi-strategy funds.
[4] “Miscellaneous funds” is comprised of insurance contracts in Finland, Norway and Switzerland.
[5] “Miscellaneous funds” is comprised of insurance contracts in Finland, Norway and Switzerland