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Debt, Senior Notes, Total Debt Maturities (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument, Receivables Financing Agreement [Abstract]          
Premium paid on senior notes   $ 0.0 $ 0.0 $ 29.7  
Total Debt Maturities [Abstract]          
Debt maturities, 2020   7.6      
Debt maturities, 2021   7.7      
Debt maturities, 2022   7.8      
Debt maturities, 2023   7.9      
Debt maturities, 2024   1,575.0      
Debt maturities, thereafter   $ 13.5      
Senior Notes [Member]          
Debt Instrument, Receivables Financing Agreement [Abstract]          
Aggregate principal amount $ 604.6       $ 575.0
Percentage of principal amount redeemed 105.156%        
Accrued and unpaid interest $ 10.2        
Write-off of unamortized debt issuance costs 15.8        
Premium paid on senior notes $ 29.7