Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Contract Assets, Current [Roll Forward]
Balance as of beginning of fiscal year	$ 38.5	$ 51.2
Recognized in current year	37.5	45.1
Reclassified to accounts receivable	(34.5)	(48.0)
Impairment	0.0	0.0
Reclassification to/from long-term	0.1	0.0
Reclassification to held for sale	0.0	7.4
Balance as of period end	41.6	40.9
Contract Assets, Noncurrent [Roll Forward]
Balance as of beginning of fiscal year	0.1	0.1
Recognized in current year	0.0	0.0
Reclassified to accounts receivable	0.0	0.0
Impairment	0.0	0.0
Reclassification to/from short-term	(0.1)	0.0
Balance as of period end	0.0	0.1
Contract Liabilities, Current [Roll Forward]
Balance as of beginning of fiscal year	78.7	71.4
Recognized in current year	97.9	57.1
Amounts in beginning balance reclassified to revenue	(33.9)	(44.8)
Current year amounts reclassified to revenue	(38.5)	(14.4)
Other	(0.2)	0.0
Reclassification to/from long-term	5.8	0.0
Balance as of period end	109.8	69.3
Contract Liabilities, Noncurrent [Roll Forward]
Balance as of beginning of fiscal year	25.9	7.3
Recognized in current year	12.4	0.5
Amounts in beginning balance reclassified to revenue	(0.5)	(0.5)
Current year amounts reclassified to revenue	0.0	0.0
Other	0.0	0.0
Reclassification to/from short-term	(5.8)	0.0
Balance as of period end	$ 32.0	$ 7.3