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Retirement Plans and Post Retirement Benefits Level 3 Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]      
Fair value of plan assets, beginning of year balance $ 265.9 $ 239.9  
Fair value of plan assets, end of year balance 265.9 239.9 $ 274.8
Multi-strategy Funds      
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 82.5    
Fair value of plan assets, end of year balance 82.5 [1]   35.0
Significant Unobservable Inputs (Level 3)      
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]      
Fair value of plan assets, beginning of year balance 12.9    
Fair value of plan assets, end of year balance 12.9   12.7
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds      
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]      
Fair value of plan assets, beginning of year balance [1] 12.9    
Fair value of plan assets, end of year balance 12.9 [1]   0.0
Net Asset Value, previously Level 3 [Member] | Multi-strategy Funds      
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]      
Fair value of plan assets, beginning of year balance 12.9 12.2  
Total unrealized gains (losses) (0.2) 0.7  
Defined Benefit Plan, Redemptions 0.2 (0.1)  
Defined Benefit Plan, Mangement Fees (0.2) (0.1)  
Fair value of plan assets, end of year balance $ 12.9 $ 12.2 $ 12.7 [2]
[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.