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Debt (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Future amortization of debt issuance costs $ 7.2 $ 10.3 $ 11.3
Future amortization of original issue discount 1.0 $ 1.4 $ 1.8
Long-term Debt, by Maturity [Abstract]      
2019 41.3    
2020 69.2    
2021 548.2    
2022 251.4    
2023 6.7    
2024 to 2028 13.9    
2029 to 2031 3.0    
Total Debt, Excluding Unamortized Debt Issuance Costs and Original Issue Discount $ 933.7