Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 15.0
Finance Lease, Right-of-Use Asset, Amortization	1.7
Finance Lease, Interest Expense	1.9
Variable Lease, Cost	1.2
Lease, Cost	19.8
Operating Lease, Payments	16.6
Finance Lease, Interest Payment on Liability	1.9
Finance Lease, Principal Payments	1.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2.5
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	0.5
Operating lease, right-of-use assets	73.1	$ 0.0
Finance Lease, Right-of-Use Asset	26.5
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	(11.1)
Assets	1,877.7	1,788.1	$ 1,802.3
Operating Lease, Liability, Current	13.9
Finance Lease, Liability, Current	1.4
Total current liabilities	280.4	449.2
Long-term operating lease liabilities	65.6	0.0
Finance Lease, Liability, Noncurrent	20.6
Operating Lease, Liability	79.5
Finance Lease, Liability	$ 22.0	23.0
Operating Lease, Weighted Average Remaining Lease Term	6 years 7 months
Finance Lease, Weighted Average Remaining Lease Term	10 years 8 months
Operating Lease, Weighted Average Discount Rate, Percent	4.90%
Finance Lease, Weighted Average Discount Rate, Percent	8.30%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 17.4
Finance Lease, Liability, Payments, Due Next Twelve Months	3.2
Lessee, Operating Lease, Liability, Payments, Due Year Two	16.7
Finance Lease, Liability, Payments, Due Year Two	3.2
Lessee, Operating Lease, Liability, Payments, Due Year Three	15.7
Finance Lease, Liability, Payments, Due Year Three	3.1
Lessee, Operating Lease, Liability, Payments, Due Year Four	9.6
Finance Lease, Liability, Payments, Due Year Four	2.9
Lessee, Operating Lease, Liability, Payments, Due Year Five	7.4
Finance Lease, Liability, Payments, Due Year Five	2.8
Lessee, Operating Lease, Liability, Payments, Due after Year Five	26.7
Finance Lease, Liability, Payments, Due after Year Five	18.7
Lessee, Operating Lease, Liability, Payments, Due	93.5
Finance Lease, Liability, Payment, Due	33.9
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(14.0)
Finance Lease, Liability, Undiscounted Excess Amount	(11.9)
Operating Leases, Future Minimum Payments Due, Next Twelve Months		12.0
Capital Leases, Future Minimum Payments Due, Next Twelve Months		3.1
Operating Leases, Future Minimum Payments, Due in Two Years		11.4
Capital Leases, Future Minimum Payments Due in Two Years		3.1
Operating Leases, Future Minimum Payments, Due in Three Years		10.4
Capital Leases, Future Minimum Payments Due in Three Years		3.1
Operating Leases, Future Minimum Payments, Due in Four Years		9.5
Capital Leases, Future Minimum Payments Due in Four Years		3.0
Operating Leases, Future Minimum Payments, Due in Five Years		7.2
Capital Leases, Future Minimum Payments Due in Five Years		2.8
Operating Leases, Future Minimum Payments, Due Thereafter		24.3
Operating Leases, Future Minimum Payments Due		74.8
Capital Leases, Future Minimum Payments Due Thereafter		21.7
Capital Leases, Future Minimum Payments Due		36.8
Capital Leases, Future Minimum Payments, Interest Included in Payments		(13.9)
Capital Lease Obligations		22.9
Liabilities	$ 1,445.7	$ 1,361.7
Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	12 years
Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Lease assets [Member]
Lessee, Lease, Description [Line Items]
Assets	$ 88.5
Lease liabilities, current [Member]
Lessee, Lease, Description [Line Items]
Total current liabilities	15.3
Lease liabilities, noncurrent [Member]
Lessee, Lease, Description [Line Items]
Liabilities, Noncurrent	86.2
Lease liabilities [Member]
Lessee, Lease, Description [Line Items]
Liabilities	101.5
Finance lease costs [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 3.6