Changes in Accounting Policies - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 251.9	$ 259.7
Total Assets	6,083.9	5,643.7	$ 5,384.0
Accrued liabilities	336.9	310.2	283.6
Deferred revenue	137.9	120.4	121.7
Noncurrent operating lease liabilities	238.5	243.9
Other long-term liabilities	109.0	111.9	122.2
Total Liabilities	4,616.2	4,445.6	4,186.8
Retained earnings	1,401.8	1,163.0	1,162.1
Total Liabilities and Stockholders' Equity	$ 6,083.9	5,643.7	$ 5,384.0
Adjustments | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		259.7
Total Assets		259.7
Accrued liabilities		26.6
Deferred revenue		(1.3)
Noncurrent operating lease liabilities		243.9
Other long-term liabilities		(10.3)
Total Liabilities		258.8
Retained earnings		0.9
Total Liabilities and Stockholders' Equity		$ 259.7