Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Share-based compensation	$ 15.6	$ 10.9
Accruals not currently deductible	21.3	20.7
Interest rate swaps	22.2	9.3
Finance lease liabilities	67.7	10.1
Net operating loss carryforwards	113.3	51.7
Foreign tax credit	33.5	34.0
Research and development credits	30.6	23.2
Depreciation and amortization	7.8	9.5
Disallowed interest carryforward	5.4	40.2
Operating lease liabilities	37.9	74.8
Other	17.7	12.1
Total gross deferred tax assets	373.0	296.5
Valuation allowance	(54.4)	(53.3)
Total net deferred tax assets	318.6	243.2
Depreciation and amortization	484.5	452.0
Prepaids	1.3	7.3
Finance lease liabilities	4.4	7.0
Capitalized costs	13.9	12.7
Unremitted foreign earnings	0.0	0.1
Debt related	7.4	9.9
Operating right-of-use assets	36.2	70.8
Other	3.2	1.1
Total gross deferred tax liabilities	550.9	560.9
Net deferred tax liabilities	$ 232.3	$ 317.7