Leases - Narratives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			5 years
Lease expiration date			Dec. 31, 2066
Lessee, operating lease, existence of option to extend			true
Lessee, finance lease, renewal term			15 years
Lessee, operating lease, existence of option to terminate			true
Lessee, operating lease, option to terminate			some of which include options to terminate the leases within one year
Lease expense		$ 5.0		$ 13.1
Lease income	$ 0.8		$ 2.4
Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	3 years		3 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	30 years		30 years
Real Estate | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			1 year
Real Estate | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			55 years
Equipment [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			2 years
Equipment [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			6 years
Cell Towers [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			4 years
Cell Towers [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease term of contract			21 years