Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Sep. 08, 2018	Feb. 24, 2018
Assets:
Short-term investments	$ 24.1	$ 24.5
Non-current investments	98.2	91.2
Total	1,177.3	313.7
Liabilities:
Derivative contracts	1.1	11.8
Contingent consideration	49.3	60.0
Total	50.4	71.8
Quoted prices in active markets for identical assets (Level 1)
Assets:
Short-term investments	22.1	22.1
Non-current investments	45.5	40.2
Total	1,122.6	260.3
Liabilities:
Derivative contracts	0.0	0.0
Contingent consideration	0.0	0.0
Total	0.0	0.0
Significant observable inputs (Level 2)
Assets:
Short-term investments	2.0	2.4
Non-current investments	52.7	51.0
Total	54.7	53.4
Liabilities:
Derivative contracts	1.1	11.8
Contingent consideration	0.0	0.0
Total	1.1	11.8
Significant unobservable inputs (Level 3)
Assets:
Short-term investments	0.0	0.0
Non-current investments	0.0	0.0
Total	0.0	0.0
Liabilities:
Derivative contracts	0.0	0.0
Contingent consideration	49.3	60.0
Total	49.3	60.0
Money market
Assets:
Money market	1,055.0	198.0
Money market | Quoted prices in active markets for identical assets (Level 1)
Assets:
Money market	1,055.0	198.0
Money market | Significant observable inputs (Level 2)
Assets:
Money market	0.0	0.0
Money market | Significant unobservable inputs (Level 3)
Assets:
Money market	$ 0.0	$ 0.0