Leases And Other Commitments - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) renewal_term finance_lease	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Operating Leased Assets [Line Items]
Operating lease right-of-use assets	$ 71.5	$ 0.0		$ 26.7
Finance lease right-of-use assets				15.3
Operating lease liability	86.0			40.4
Finance lease liability	15.0			15.9
Rent expense		$ 12.5	$ 11.1
Amortization of operating lease right-of-use asset	9.1
Purchase obligations	$ 165.8
Term of purchase obligations	1 year
Leased Buildings - Mesa, Arizona Expiring March 2028
Operating Leased Assets [Line Items]
Renewal term	5 years
Number of financing leases | finance_lease	1
Number of renewal terms | renewal_term	4
Minimum
Operating Leased Assets [Line Items]
Renewal term	3 years
Remaining lease terms	1 year
Maximum
Operating Leased Assets [Line Items]
Renewal term	5 years
Remaining lease terms	13 years
Retained Earnings | Accounting Standards Update 2016-02
Operating Leased Assets [Line Items]
Cumulative-effect adjustment				$ (2.1)