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Financial Instruments (Forward Interest Rate Swap Agreements) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 24, 2018	Jul. 31, 2018	Jun. 25, 2018	May 23, 2018	Mar. 31, 2018
Interest Rate Swap
Derivative [Line Items]
Notional amount	$ 1,700.0		$ 300.0	$ 200.0	$ 1,000.0	$ 0.0
Fixed interest rate			2.885%	2.723%	2.915%
Interest rate swap agreements - fixed rate paid 2.744%
Derivative [Line Items]
Notional amount		$ 50.0
Fixed interest rate		2.744%
Interest rate swap agreements - fixed rate paid 2.808%
Derivative [Line Items]
Notional amount		$ 100.0
Fixed interest rate		2.808%
Interest rate swap - fixed rate paid 2.728%
Derivative [Line Items]
Notional amount		$ 50.0
Fixed interest rate		2.728%