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General (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liabilities	$ 174.2
Operating Leases, Right-of-use assets	146.3			$ 0.0
Accounting for Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liabilities			$ 187.2
Operating Leases, Right-of-use assets			157.4
Lease Incentives			$ 29.8
Customer relationships
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finite-lived intangible assets		$ 1,500.0
Finite-Lived Intangible Asset, Useful Life		17 years
Intangible Assets, Amortization Period
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in amortization expense	$ 11.3
Decrease in earnings per share, basic and diluted (in usd per share)	$ 0.05

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This item represents the deferred charge for an incentive or inducement granted by a lessor to a lessee, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental revenue over the lease term.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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