Lease Additional Information (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2016
Lessee, Lease, Description [Line Items]
Operating lease liability	$ 967.7	[1]		$ 1,189.6
Operating lease right-of-use assets	904.5			$ 1,115.5	$ 0.0
Adoption of accounting standards	1.8		$ (91.4)
Impact of Restatement on Opening Retained Earnings, Net of Tax						$ 42.0
Other Liabilities, Current	$ 1,471.0				1,771.6
Short-term lease, lease term	12 months
Operating Lease, Liability, Current	$ 224.3				0.0
Retained earnings	901.6				$ 1,072.2
Lease Agreements
Lessee, Lease, Description [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 236.2
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	10 years
Other Assets | Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	60 days
Other Assets | Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	5 years
Commercial Real Estate | Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	15 years
Other Current Liabilities
Lessee, Lease, Description [Line Items]
Other Liabilities, Current						1,044.4
Other Liabilities
Lessee, Lease, Description [Line Items]
Other Liabilities						131.3
Retained Earnings
Lessee, Lease, Description [Line Items]
Retained earnings						3,231.4
Other Current Liabilities
Lessee, Lease, Description [Line Items]
Impact of Restatement on Opening Retained Earnings, Net of Tax						5.0
Other Liabilities
Lessee, Lease, Description [Line Items]
Impact of Restatement on Opening Retained Earnings, Net of Tax						$ 37.0
Retained Earnings
Lessee, Lease, Description [Line Items]
Adoption of accounting standards	$ 1.8		$ (91.5)

[1] Includes the current portion of $224.3 million for operating leases.