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Basis of Preparation - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Right-of-use operating lease assets $ 91.4     $ 0.0
Operating lease liabilities $ 93.9   $ 93.6 $ 0.0
Weighted average incremental borrowing rate (percent) 5.00%      
Asset obtained in exchange for operating lease liability $ 3.1      
Operating lease charge (4.5) $ 0.0    
Amortization of right-of-use operating lease assets (3.3) 0.0    
Interest on operating lease liabilities (1.2)      
Accounting Standards Update 2016-09 | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of new accounting principle in period of adoption [1] $ (2.4) $ 0.0    
Leased office real estate and motor vehicles        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Right-of-use operating lease assets     $ 91.2  
[1] The $2.4 million relates to the cumulative effect-adjustment to opening retained earnings as a result of the recognition of operating lease right-of-use assets and corresponding liabilities on the balance sheet following the adoption of ASU 2016-02. The adjustment has been applied using a modified retrospective approach.