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Employee Benefit Plans - Postretirement Benefit Plans (Details) - Postretirement Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee benefit plans      
Other assets $ 0.0    
Unfunded direct benefits paid 8.3    
Estimated future benefit payments, net of subsidies:      
2019 8.5    
2020 7.8    
2021 7.1    
2022 6.4    
2023 5.8    
Subsequent five years 22.1    
Change in projected benefit obligation:      
Projected benefit obligation — beginning of year 77.6 $ 115.3  
Interest cost 2.3 3.5 $ 4.2
Actuarial gains (2.3) (5.4)  
Benefits paid (8.3) (9.0)  
Plan amendment (0.1) (26.8)  
Projected benefit obligation — end of year 68.8 77.6 115.3
Funded status at year-end (68.8) (77.6)  
Accrued expenses 8.3 8.7  
Other long-term liabilities 60.5 68.9  
Net amount recognized (68.8) (77.6)  
Amount recognized in accumulated other comprehensive income (pre-tax) consists of — net prior service (credits) costs (27.1) (31.0)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0.0 0.0 0.0
Interest cost 2.3 3.5 4.2
Amortization of unrecognized prior service credits (4.0) (1.7) (0.8)
Plan amendment 0.0 (2.6) 0.0
Recognized net actuarial (gains) losses (2.3) (2.8) 0.6
Total net periodic pension benefit expense $ (4.0) $ (3.6) $ 4.0
Assumptions - Actuarial assumptions used in accounting for plans      
Health care cost trend rate for next year 7.00% 7.25% 7.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 5.00% 5.00% 5.00%
Year that the rate reaches the ultimate trend rate 2027 2027 2027
Discount rate used in determining net periodic postretirement benefit expense 3.34% 3.60% 3.88%
Discount rate used in determining year-end postretirement benefit obligation 4.09% 3.34% 3.69%