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Long-lived Assets - Intangible Assets Subject to Amortization, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Gross carrying amount $ 1,701.5 $ 1,696.5
Accumulated amortization (580.9) (530.8)
Total 1,120.6 1,165.7
Customer relationships    
Gross carrying amount 1,513.8 1,509.7
Accumulated amortization (551.5) (504.7)
Licenses and other    
Gross carrying amount 187.7 186.8
Accumulated amortization $ (29.4) $ (26.1)