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Debt - Summary of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Feb. 28, 2018
Feb. 02, 2018
Dec. 31, 2017
Aug. 31, 2017
Mar. 31, 2016
Nov. 30, 2010
Debt Instrument [Line Items]              
Long-term debt $ 1,737.1     $ 987.1      
Term loan, current portion 25.0            
Notes 2022 Term | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt $ 298.3     $ 297.9      
Senior notes, stated percentage 3.625%     3.625%     3.625%
Notes 2026 Term | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt $ 395.1     $ 394.4      
Senior notes, stated percentage 3.35%     3.35%   3.35%  
Notes 2027 Term | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt $ 295.4     $ 294.8      
Senior notes, stated percentage 3.15%     3.15% 3.15%    
Notes 2028 Term | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt $ 443.3     $ 0.0      
Senior notes, stated percentage 3.50% 3.50% 3.50%        
Notes 2023 Term | Senior Notes              
Debt Instrument [Line Items]              
Long-term debt $ 305.0     $ 0.0      
Term loan, current portion $ 25.0