Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Contract Assets, Current [Roll Forward]
Balance as of beginning of fiscal year	$ 38.9	$ 38.5
Recognized in current year	48.9	37.5
Reclassified to accounts receivable	(30.4)	(34.5)
Impairment	0.0	0.0
Reclassification to/from long-term and contract liability	(5.1)	0.1
Balance as of period end	52.3	41.6
Contract Assets, Noncurrent [Roll Forward]
Balance as of beginning of fiscal year	0.0	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	0.0	(0.1)
Balance as of period end	0.0	0.0
Contract Liabilities, Current [Roll Forward]
Balance as of beginning of fiscal year	111.8	78.7
Recognized in current year	77.9	97.9
Amounts in beginning balance reclassified to revenue	(63.9)	(33.9)
Current year amounts reclassified to revenue	(18.7)	(38.5)
Other	0.0	(0.2)
Reclassification to/from long-term and contract asset	(3.3)	5.8
Balance as of period end	103.8	109.8
Contract Liabilities, Noncurrent [Roll Forward]
Balance as of beginning of fiscal year	32.0	25.9
Recognized in current year	41.0	12.4
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	(1.8)	(5.8)
Balance as of period end	$ 70.7	$ 32.0