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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Contract assets - current $ 39.0   $ 39.0   $ 38.4
Contract assets - long-term 20.8   20.8   21.6
Deferred revenue - current (217.8)   (217.8)   (246.4)
Deferred revenue - long-term (130.4)   (130.4)   $ (147.0)
Revenue recognized that was included in deferred revenue at the beginning of the period $ 68.2 $ 74.0 $ 149.2 $ 172.0