Leases Lessee Disclosures (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	5
Lease Expense	$ 3.3
Lease Expiration Date	Dec. 31, 2066
Lessee, Finance Lease, Renewal Term	15
Operating Lease, Right-of-Use Asset	$ 37.2	$ 38.3	$ 0.0
Finance Lease, Right-of-Use Asset	28.1
Operating Lease, Liability, Current	9.8
Operating Lease, Liability, Noncurrent	34.5		$ 0.0
Operating Lease, Liability	44.3	$ 46.2
Finance Lease, Liability, Current	15.3
Finance Lease, Liability, Noncurrent	65.4
Finance Lease, Liability	80.7
Operating Lease, Cost	3.1
Short-term Lease, Cost	0.1
Variable Lease, Cost	0.5
Finance Lease, Right-of-Use Asset, Amortization	1.9
Finance Lease, Interest Expense	1.2
Lease, Cost	6.8
Finance Lease, Interest Payment on Liability	1.2
Operating Lease, Payments	3.2
Finance Lease, Principal Payments	3.0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	1.3
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 9.8
Operating Lease, Weighted Average Remaining Lease Term	8 years 2 months 17 days
Finance Lease, Weighted Average Remaining Lease Term	7 years 7 months 3 days
Operating Lease, Weighted Average Discount Rate, Percent	7.08%
Finance Lease, Weighted Average Discount Rate, Percent	6.86%
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year	$ 12.7
Finance Leases, Future Minimum Payments, Remainder of Fiscal Year	19.5
Lessee, Operating Lease, Liability, Payments, Due Year Two	10.3
Finance Leases, Future Minimum Payments, Due in Two Years	17.3
Operating Leases, Future Minimum Payments, Due in Three Years	6.3
Finance Leases, Future Minimum Payments, Due in Three Years	13.2
Operating Leases, Future Minimum Payments, Due in Four Years	4.7
Finance Leases, Future Minimum Payments, Due in Four Years	8.1
Operating Leases, Future Minimum Payments, Due in Five Years	4.2
Finance Leases, Future Minimum Payments, Due in Five Years	7.4
Operating Leases, Future Minimum Payments, Due Thereafter	23.0
Finance Leases, Future Minimum Payments, Due Thereafter	40.9
Operating Leases, Future Minimum Payments Due	61.2
Finance Lease, Future Minimum Payments Due	106.4
Operating Lease Imputed Interest	(15.6)
Finance Lease Imputed Interest	(25.7)
Operating Lease Liability, including Not Yet Commenced Leases	45.6
Lessee Operating Lease, Lease Not yet Commenced Amount	$ 1.3
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Real Estate [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	1
Real Estate [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	55
Equipment [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	1
Equipment [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	6
Cell Towers [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	4
Cell Towers [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating and Finance Lease, Term of Contract	21