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Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Gross carrying amount $ 4,217.6 $ 4,194.4
Accumulated amortization (3,645.5) (3,163.2)
Net carrying amount 572.1 1,031.2
Customer relationships    
Gross carrying amount 3,653.9 3,673.1
Accumulated amortization (3,363.6) (2,914.2)
Net carrying amount 290.3 758.9
Other    
Gross carrying amount 563.7 521.3
Accumulated amortization (281.9) (249.0)
Net carrying amount $ 281.8 $ 272.3
Minimum | Customer relationships    
Estimated useful life at December 31, 2019 5 years  
Minimum | Other    
Estimated useful life at December 31, 2019 2 years  
Maximum | Customer relationships    
Estimated useful life at December 31, 2019 10 years  
Maximum | Other    
Estimated useful life at December 31, 2019 15 years