Lease Additional Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2016
Lessee, Lease, Description [Line Items]
Operating lease liability	$ 1,133.9	[1]		$ 1,189.6
Operating lease right-of-use assets	1,063.9			$ 1,115.5
Adoption of accounting standards	1.8		$ (91.4)
Impact of Restatement on Opening Retained Earnings, Net of Tax						$ 42.0
Other Liabilities, Current	$ 1,708.4				$ 1,771.6
Short-term lease, lease term	12 months
Operating Lease, Liability, Current	$ 308.7
Retained earnings	1,047.9				$ 1,072.2
Lease Agreements
Lessee, Lease, Description [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 236.2
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	9 years
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						1,422.6
Other Liabilities
Lessee, Lease, Description [Line Items]
Other Liabilities						395.0
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

[1] Includes the current portion of $308.7 million for operating leases.