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Employee Benefits - Postretirement Plan and Summary Information for All Defined Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Executive Retirement Plans      
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods      
2017 $ 14.8    
2018 1.2    
2019 1.2    
2020 12.7    
2021 1.1    
2022-2026 12.1    
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during 2017      
Actuarial loss 1.1    
Total 1.1    
Defined Benefit Plans      
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods      
2017 4.0    
2018 4.2    
2019 4.5    
2020 4.6    
2021 4.8    
2022-2026 27.5    
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during 2017      
Actuarial loss 1.5    
Prior service cost 0.3    
Total $ 1.8    
Supplemental Bonus Plan      
Stock-Based Compensation      
Number of shares of the entity to be contributed to the plan as a result of acquisition 258,006    
Number of shares equivalent to the cash liability associated with post-employment liability 82,354    
Aggregate obligation to the plan acquired $ 6.6    
Expense (income) from mark to market adjustment $ 2.1 $ (0.2) $ (1.3)