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Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 265.9 $ 239.9 $ 237.4
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 147.5 151.2  
Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 105.5 76.5  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.9 12.2  
Multi-strategy Funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 82.5 75.1  
Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 69.6 62.9  
Multi-strategy Funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 0.0 0.0  
Multi-strategy Funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.9 [1] 12.2 [1] $ 13.3
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3.0 2.2  
Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Cash and Cash Equivalents | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3.0 2.2  
Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Domestic stock funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 56.2 51.3  
Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 42.2 38.0  
Domestic stock funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 14.0 13.3  
Domestic stock funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0.0 0.0  
International stock funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 43.1 38.5  
International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 15.5 13.5  
International stock funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 27.6 25.0  
International stock funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0.0 0.0  
Domestic bond funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 40.2 [3] 36.8 [2]  
Domestic bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 20.2 36.8  
Domestic bond funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 20.0 0.0  
Domestic bond funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0.0 0.0  
International bond funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [3] 40.9 36.0  
International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0.0 0.0  
International bond funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 40.9 36.0  
International bond funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] $ 0.0 $ 0.0  
UNITED STATES      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 100.00% 100.00%  
UNITED STATES | Equity Securities      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 40.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 40.00% 40.00%  
UNITED STATES | Debt Securities      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 20.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 20.00% 20.00%  
UNITED STATES | Multi-strategy Funds      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 40.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 40.00% 40.00%  
Non-US [Member]      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 100.00% 100.00%  
Non-US [Member] | Equity Securities      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 27.10%    
Defined Benefit Plan, Actual Plan Asset Allocation 27.80% 29.00%  
Non-US [Member] | Debt Securities      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 71.30%    
Defined Benefit Plan, Actual Plan Asset Allocation 70.40% 70.00%  
Non-US [Member] | Cash and Cash Equivalents      
Target Allocations [Abstract]      
Target Plan Asset Allocation 2016 1.60%    
Defined Benefit Plan, Actual Plan Asset Allocation 1.80% 1.00%  
[1] The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
[2] Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[3] Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.