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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans      
Curtailment charges recorded to write-off previously unrecognized prior service costs     $ 1.5
Reduced the projected benefit obligation     12.5
Change in projected benefit obligation      
Balance at beginning of the year 138.0 121.2  
Service cost 0.5 0.6 5.3
Administration costs paid (0.8) (0.9)  
Interest cost 5.4 5.7 6.0
Actuarial (gain) loss (12.5) 15.6  
Benefits paid (4.3) (4.2)  
Balance at end of year 126.3 138.0 121.2
Change in fair value of plan assets      
Balance at beginning of the year 115.8 108.4  
Actual (loss) gain on assets (7.7) 11.8  
Employer contributions 0.7 0.7  
Administration costs paid (0.8) (0.9)  
Benefits paid (4.3) (4.2)  
Fair value of plan assets at end of the year 103.7 115.8 108.4
Funded status at end of year (22.6) (22.2)  
Amounts recognized in the consolidated balance sheet      
Current liabilities (0.6) (0.6)  
Noncurrent liabilities (22.0) (21.6)  
Net amount recognized (22.6) (22.2)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss recognized 42.2 41.2  
Information for pension plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 126.3 138.0  
Accumulated benefit obligation 126.3 138.0  
Fair value of plan assets 103.7 115.8  
Components of net periodic benefit cost      
Service cost-benefits earned 0.5 0.6 5.3
Interest costs on benefits obligation 5.4 5.7 6.0
Expected return on assets (6.8) (6.9) (7.5)
Prior service cost amortization     0.3
Net actuarial loss amortization 1.0 0.6 2.7
Curtailment charge     1.5
Net periodic benefit cost 0.1   8.3
Estimated amount that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next year      
Net actuarial loss $ 1.1