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Long-lived Assets (Schedule of expected future amortization expense for finite lived intangible assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Long-lived Assets [Abstract]    
2019 $ 521.4  
2020 167.0  
2021 82.2  
2022 34.0  
2023 28.5  
Thereafter 198.1  
Net carrying amount $ 1,031.2 $ 1,608.5