Recent Accounting Pronouncements Adoption of ASU 2014-09 - Hypothetical Results Under Previous Standard (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 2,745.1	$ 2,585.3	$ 2,405.4
Costs of revenue	1,857.9	1,765.4	1,644.5
Income Tax Expense (Benefit)	57.7	194.6	76.0
Net income	334.6	113.3	$ 186.6
Receivables, net	540.0	629.6
Inventories, net	380.5	311.9
Other current assets	163.4	147.4
Deferred income taxes	164.5	149.9
Accrued liabilities	416.7	384.4
Other non-current liabilities	166.5	175.6
Retained earnings	2,110.3	$ 1,856.1		$ 1,696.7
Hypothetical Amount Under Previous Standard [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	2,734.2
Costs of revenue	1,848.5
Income Tax Expense (Benefit)	57.3
Net income	333.5
Receivables, net	580.5
Inventories, net	322.0
Other current assets	141.6
Deferred income taxes	163.8
Accrued liabilities	372.2
Other non-current liabilities	167.5
Retained earnings	2,113.3
Hypothetical Effect of Change Due to Adoption of New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	(10.9)
Costs of revenue	(9.4)
Income Tax Expense (Benefit)	(0.4)
Net income	(1.1)
Receivables, net	40.5
Inventories, net	(58.5)
Other current assets	(21.8)
Deferred income taxes	(0.7)
Accrued liabilities	(44.5)
Other non-current liabilities	1.0
Retained earnings	$ 3.0